If nothing ________， the oceans will turn into fish deserts.

A. does                B. had been done

C. will do           D. is done

Around two o'clock every night, Sue will start talking in her dream. It somewhat ________ us.

A. bothers                B. had bothered

C. would bother           D. bothered

“What do you want to be？” asked Mrs. Crawford. “Oh, I ________ president，” said the boy, with a smile.

A. have been              B. am

C. was                    D. will be

—Could I use your car tomorrow morning?

—Sure.I  ________  a report at home.

A．will be writing         B．will have written

C．have written           D．have been writing

—I don't understand why you didn't go to the lecture yesterday afternoon.

—I'm so sorry. But I________ my homework.

A．had done             B. was doing

C. would do            D. am doing

I ________ to visit you later that day, but I had to phone and cancel.

A. come                B. came

C. am coming           D. was coming

I didn't think I'd like the movie, but actually it   ________ pretty good.

A．has been            B. was

C．had been            D．would be

We are confident that the environment ________ by our further efforts to reduce pollution.

A．had been improved        B．will be improved

C．is improved              D．was improved

He was unhappy when he sold his guitar. After all，he________it for a very long time.

A．has had             B．had had

C．has                 D．had

Hurry up，kids! The school bus    ________   for us!

A. waits                B. was waiting

C. waited               D. is waiting