—Shall I invite Mike to my party?

—Yes, it will be nice if you ________ .

A. do

B. do invite

C. are

D. invite

We often hear him ________ English songs.

A. to sing

B. sing

C. singing

D. to be singing

The children are made ________ twelve hours a day.

A. to work

B. work

C. working

D. worked

The doctor did what he could ________ the boy, but in vain.

A. save

B. to save

C. saving

D. saved

Equipped with modern facilities, today's libraries differ greatly from ___________.

A. those of the past

B. the past

C. which of the past

D. these past

The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.

A. seeing

B. having

C. to have seen

D. to see

Generally speaking, ________ according to the directions, the drug has no side effect.

A. when taking

B. when taken

C. when to take

D. when to be taken

He stood there for a while with his hands ________.

A. raising

B. raised

C. rose

D. risen

________ your head, and you'll see the sun ________ now.

A. Raise; rising

B. Raise; raising

C. To raise; rising

D. Lift; being risen

We must do whatever we can ________ those who are in trouble.

A. to help

B. help

C. helping

D. do help