--- The pollution is becoming more and more serious in our hometown.
--- That’s right. We should do ________ we can to protect the environment.
A. nothing
B. everything
C. something
--- More than 1.3 billion people live in China now.
--- Wow, That’s almost ________ of the world ‘s population.
A. one fifths B. half of C. one fifth
There are many birds ________ among the trees.
A. flying B. fly C. to fly
__________ of the students likes reading. They both like playing sports.
A. None B. Neither C. All
--- The population of China is really large!
--- __________ We should take measures to control it.
A. So it is.
B. So he is
C. So is it..
--- Why should we plant more trees to protect the environment?
--- Because trees can stop the wind from ________ the earth _________.
A. washing ;away
B. blowing; away
C. changing ;into
