We were just about to call him ________his mother came back.
| A．while |
| B．as |
| C．when |
| D．because |
____ the watch and see if you can find out what’s wrong with it.
A. Pack up Break down C. Dig out D. Take apart
There is no doubt ____ John will come by bus.
| A．if | B．why | C．that | D．how |
Before you leave the lab, the doors and windows ____shut in case of rain.
| A．is | B．are | C．is to be | D．are to be |
Did John ____ the general cleaning yesterday afternoon?
| A．join | B．attend | C．take | D．take part in |
To enjoy the scenery, Irene would rather spend long hours on the train ___travel by air.
| A．as | B．to | C．than | D．while |