---- Look! A man is cutting a tree on the moon.
----It ______ be true. The teacher said there is no air on the moon.
| A．can’t | B．may not |
| C．shouldn’t | D．mustn’t |
The price of the shoes ________than before. I can't afford two pairs.
A. is more expensive
B. is much higher
C. is much lower
Because Robert was seen ____ the room, everyone thought he was the thief.
A. to enter B. enter C. Entered
______ has Miss Green taught in your school? For about six years.
A. How long B. How soon C. How far
I hear there will be all kinds of robots________ twenty _____ time .
A. after, years B. in, years’ C. for, year’s
I know Beijing very well since I ________ there three times.
A. have been B. went C. have gone