I’d rather you _____ make any comment on the issue for the time being.

Send for a doctor quickly. The old man is badly hurt so he needs _____ at once.

There was a heavy fog this morning, so none of the planes could _____.

A news report is usually very short, （ ） when it is about something very important.

After （ ） the numbers in every possible combination, we finally hit on a solution.

Many teenagers feel no difficulty （ ） computer.

What time would it be convenient _____us to meet again?

We were disappointed yesterday because it wasn’t such a good dinner （ ） she had promised us．

The doctor tried to do an experiment to find out the （ ） of the medicine on the mice.

When I heard that my mother would come to see me this weekend, I （ ） for her to arrive.

In order to buy her house she had to obtain a_____from the bank.

I cannot tell the_____difference between the twins.