I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.
| A．before | B．since | C．till | D．after |
---Why can't I smoke here?
---At no time__________ in the meeting-room
| A．is smoking permitted | B．smoking is permitted |
| C．smoking is it permitted | D．does smoking permit |
______ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal.
| A．When | B．As | C．While | D．Before |
He devoted most of his time to his research, believing his hard work would___sooner or later.
| A．put off | B．take off | C．come off | D．pay off |
China, a country with 145 million elderly people, will remain _______ ageing society during this century, according to _______ Chinese population experts.
| A．/; the | B．an; / | C．an; the | D．the; / |
--- Shall we walk around the park or go for a bike ride?
--- _________. They are both good activities to me .
| A．Yes, I like them very much | B．It makes no difference to me |
| C．That’s all right | D．I’d prefer a bike ride |