— The teacher asked us ________________
A. What the bad effect of pollution are.
B. What were the bad effect of pollution.
C. What the bad effect of pollution were.
—How many boys are there in our school?
—In our class, ___________of the students are boys.
A. three fifths B. third fifths C. three fifth
—Have they visited the zoo many times.
—______________. Only once.
A. Yes, they have B. No, they haven’t C. No, they have
His father has worked in this factory________ he came here in 1985.
A. for B. since C.when
The traffic in the town _______be terrible, but now it has improved a lot. I think you will ________it soon.
A. get used to; used to B. get used to; use to C. used to; get used to
—It smells terrible. What has happened here?
—Look, there is much waste gas _______from the chemical factory.
A. pouring B. pour C. pours
