Had the governments and scientists not worked together , AIDS-related deaths _______ since their highest in 2005.

A. had not fallen B. would not fall

C. did not fall D. would not have fallen

—Can’t you stay a little longer?

—It’s getting late. I really _____go now, My daughter is home alone.

A .may B .can

C . must D .dare

Without his wartime experiences, Hemingway____ his famous novel A Farewell to Arms.

A. didn’t write B. hadn’t written

C. wouldn’t write D. wouldn’t have written

You ____ be Carol. You haven’t changed a bit after all these years.

A. must B. can

C. will D. shall

I ______ have worried before I came to the new school, for my classmates here are very friendly to me.

A. mightn’t B. mustn’t

C. needn’t D. couldn’t

You _____be careful with the camera. It costs!

A .must B. may

C. can D. will

You feel all the training a waste of time, but I’m a hundred percent sure later you’ll be grateful you did it.

A. should B. need

C. shall D. may

—Sorry, Mum! I failed the job interview again.

—Oh, it's too bad. You have made full preparations.

A. must B. can

C. would D. should

It is lucky we booked a room, or we ______nowhere to stay now.

A. had B. had had

C. would have D. would havehad

I’ve ordered some pizza, so we _______ worry about cooking when we get home tired.

A. can’t B. dare not

C. needn’t D. may not