23.— It’s a long time _____ I saw you last.
— Yes, and what a pity! It will be a long time ____ we see each other again.
| A．before, since | B．since, before | C．when, when | D．since, when |
There is no good for the parents to provide everything________their children.
| A．with |
| B．for |
| C．to |
| D．by |
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 |