—Hi，Joan.Any idea where Tom is?
—He ________ on the playground.I saw him there playing football just now.
A．shall be B．should have been
C．must be D．might have been
—Guess what？I came first in that contest.
—Great！You ________ a lot during the past two weeks.
A．must practise B．should practise
C．should have practised D．must have practised
—Where will you start your work after graduation?
—Mum，it's not been decided yet.I ________ continue my study for a higher degree.
A．need B．must C．would D．might
Many people think of the brain as a mystery.They don't know much about intelligence and how it works.When they do think about what intelligence is，many people believe that a person is born smart，average，or dumb—and stays that way in the whole life.But new research shows that the brain is more like a muscle—it changes and gets stronger when you use it.And scientists have been able to show just how the brain grows and gets stronger when you learn.
Everyone knows that when you lift weights，your muscles get bigger and you get stronger.A person who can't lift 20 pounds when he/she starts exercising can get strong enough to lift 100 pounds after working out for a long time.That's because the muscles become larger and stronger with exercise.And when you stop exercising，the muscles shrink and you get weaker.That's why people say “Use it or lose it！”
But most people don't know that when they practice and learn new things，parts of their brain change and get larger a lot like muscles do when they exercise. Inside the cortex(皮层)of the brain are billions of tiny nerve cells，called neurons. The nerve cells have branches connecting them to other cells in a complicated network. Communication between these brain cells is what allows us to think and solve problems. When you learn new things，these tiny connections in the brain actually multiply and get stronger.The more you challenge your mind to learn，the more your brain cells grow.Then，things that you once found very hard or even impossible to do—like speaking a foreign language or doing algebra(代数)—seem to become easy after learning them for a period of time.The result is a stronger，smarter brain.
Scientists started thinking that the human brain could develop and change when they studied animals'brains.They found out that animals that lived in a challenging environment were more perspicacious—they were better at solving problems and learning new things.
1.According to the first paragraph，________.
A．the function of our brain is like that of the muscle
B．until now it's impossible to explain the brain's mystery
C．many people believe one's intelligence is naturally determined
D．one's brain grows stronger as the age increases
2.Training muscles is compared to ________.
A．using the brain
B．connecting things in your brain
C．lifting weights
D．doing research about the brain
3.What does the underlined word“perspicacious”in the last paragraph probably mean?
A．Strong. B．Smart.
C．Popular. D．Active.
4.The following paragraph will most probably talk about ________.
A．the differences between animals'brains and humans'brains
B．the relation between human brains and muscles
C．scientists' findings about animals' brains
D．how to make your brain smarter through selfdevelopment
As I held my father's hands one night，I couldn't help but notice their calluses(老茧) and roughness.His hands tell the story of his life as a ____，including all his struggles.
One summer，I remember，a drought(旱灾)hit Ontario，turning it into a____desert.On one of those hot mornings I was picking sweet corn with my dad to fill the last ____from the grocery store.Fifty dozen was all we needed，which____took twenty minutes. That morning，however，the process didn't___ quickly.After forty minutes of aimlessly walking in the field，we____ needed twenty dozen.I was completely frustrated and ____.Dropping the basket heavily，I declared，“If the store wants its last twenty dozen，they can pick it themselves！”Dad____，“Just think，my little girl，only ten dozen left for each of us and then we're____.”Such is Dad—whatever problem he ____，he never gives up.
____，the disastrous effects of the drought were felt all over our country.It was a challenging time for everyone，____Dad remained optimistic.He__23__to be grateful for other things like good health and food on our plates.Only then did I truly begin to____Dad and his faith that guided us through the hard times.
Dad is also a living example of real____.From dawn to dusk，he works countless hours to ____our family.He always puts our happiness ____his own，and never fails to cheer me on at my sports games____his exhaustion after long days.His loving and selfless nature has inspired me to become more sympathetic and____，putting others first.
Dad，the life____I have learned from you will stay with me forever.You are my father，teacher，friend and，most importantly，my hero.
1.A.teacher B．gardener C．farmer D．grocer
2.A.stormy B．lively
C．disappearing D．burning
3.A.order B．form C．gap D．position
4.A.repeatedly B．normally C．finally D．really
5.A.go B．begin C．occur D．change
6.A.yet B．still C．even D．nearly
7.A.surprised B．nervous C．angry D．frightened
8.A.apologized B．cried C．complained D．laughed
9.A.lost B．done C．gone D．touched
10.A.meets with B．brings up C．works out D．thinks about
11.A.Thankfully B．Hopefully C．Unfortunately D．Strangely
12.A.or B．for C．so D．but
13.A.happened B．seemed C．continued D．aimed
14.A.face B．appreciate C．examine D．question
15.A.love B．pride C．friendship D．honesty
16.A.support B．settle C．start D．impress
17.A.after B．before C．beside D．under
18.A.in spite of B．in terms of C．in control of D．in place of
19.A.careful B．regretfu C．considerate D．humorous
20.A.history B．motto C．patterns D．lessons
—Why do you look so puzzled?
—Oh，I ________ over a most difficult maths problem.
A．thought B．have thought
C．am thinking D．think
