I ______ him in time, otherwise he would have fallen off the bike.
| A．had supported | B．supported | C．have supported | D．Support |
. I wrote to my parents once a week,____ I was too busy with my teaching work.
| A．it | B．unless | C．when | D．as |
. However, at times this balance in nature is disturbed, ____ a number of possibly unforeseen effects.
| A．lying in | B．calling in | C．taking in | D．resulting in |
.--- He has to finish the experiment today. He must be in the lab,____?
---That s quite possible.
| A．mustn't he | B．won't he | C．doesn't he | D．isn't he |
. Let us suppose that you are in____ position of____ parent. Would you allow your child to do such a thing?
| A．a; a | B．a; the | C．the; a | D．the; the |
. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____.
| A．were having | B．had had | C．were to have | D．had |