We to start at once, or we will miss the train.
A. tell B. have told
C. are told D. told
—How many times Carl to the Great Wall?
—Only once.
A. does ;go B. did; go
C. has; gone D. has; been
The traffic signs warn people after drinking.
A. to drive B. not to drive
C. driving D. don’t drive
A smile nothing, but gives much.
A. costs B. spends C. cost D. spend
They heard the party was because of exam.
A. put on B. put up C. put off D. put down
You return the book now. You can keep it until next week if you like.
A. have to B. can’t C. mustn’t D. needn’t