He was so busy that he couldn’t help ____________ the experiment.
| A．doing | B．do | C．did | D．done |
It’s a long trip and we’ll have to ___________ early tomorrow morning .
| A．start off | B．go off | C．take off | D．put off |
The way you thought of _________ the work is very good .
| A．doing | B．to do | C． that do | D．which to do |
The doctor advised Tom strongly that he should take a holiday, but ________ didn’t help.
| A．it | B．who | C．which | D．he |
Our success _____whether everyone works hard or not.
| A．lies down | B．leads to | C．depends on | D．results in |
We’d better hurry. Our teacher ________ us.
| A．wait for | B．must wait for | C．must be waiting for | D．has waited for |