She heard a continual strange noise coming from the next room, her heart （ ） fast.

If you carefully _____ the problem again, you will find a way out.

I have made_____I will never go back on my words.

Our main concern is to _____ the living standard of the people.

We didn’t finish the work in time. You _____ us since you were there.

After （ ） seemed to be an endless wait, it was finally his turn to have the interview.

Not until quite recently _____ any idea of what a guided rocket is like.

If you suspect that illness might be serious，you should not （ ） going to the doctor.

It was once a difficult time, but in the end everything _____ all right.

Tom might not have made such a serious mistake if he _____ your advice.

Seeing her father come back, （ ）.

I have no objection （ ） your design for the new type of machine this time.