Experts believe people can waste less food by shopping only when it is necessary.
| A．why | B．where | C．that | D．what |
32．Hesitating what to do，________．
| A．so let’s not go outing | B．the tour was cancelled |
| C．but we should still take the tour | D．we had to stay home |
31．The man stopped his bicycle beside the car______it had a broken chain．
| A．or | B．until | C．as | D．Yet |
30．Mike has an active mind；he can retell a story_________anybody else in the classroom．
| A．more vividly than | B．much vivid than |
| C．as vivid as | D．so vividly as |
29．The attackers were arrested and didn’t know where they ______．
| A．would take | B．are taken | C．were being taken | D．will be taken |
28．___________a time in the 1960s when young people liked wearing army uniforms.
| A．It was | B．There was | C．It is | D．There is |