Experts believe________people can waste less food by shopping only when it is necessary.
| A．why | B．where |
| C．that | D．what |
______ 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 |
John plays football __________, if not better than, David.
| A．as well | B．as well as | C．so well | D．so well as |