Not until I came home last night ________ to bed.
| A．Mum did go | B．did Mum go |
| C．went Mum | D．Mum went |
Wait until you are________in.
| A．permitting to come |
| B．permitted to come |
| C．permitted coming |
| D．permitting coming |
He said he would keep________the school rules and keep________smoking.
| A．up; down |
| B．from; to |
| C．out; away from |
| D．to; off |
One of the advantages of living on top floor of a high rise is that you can get a good________.
| A．sight |
| B．scene |
| C．view |
| D．look |
In the meantime, the question facing business is whether such research is________the costs.
| A．valuable |
| B．worth of |
| C．worthy of |
| D．worthwhile |
________some of this juice—perhaps you'll like it.
| A．Trying |
| B．Try |
| C．To try |
| D．Have try |