—Let’s go climbing to the top of the mountain, shall we?
—You _______be joking! Don’t you know I’m afraid of high places?
A. may B. must
C. can D. should
March 22 nd is Water World Day, but too much water ______ in our life every day.
A. wastes B. wasted
C. is wasted D. was wasted
—Do you think the problems in the physics test were difficult?
—Sure. I could ______ work them out.
A. easily B. hardly
C. nearly D. finally
You won't feel happy at school ______ you get on well with your classmates.
A. though B. when
C. unless D. because
Read this story, _____ you will realize that not everything can be bought with money.
A. or B. and
C. but D. so
We can do a lot to stay healthy. ______, we should eat a balanced(平衡的) diet.
A. At a time B. In fact
C. First of all D. All together
