52. The struggle against sand storm will not end _____ victory unless we pay much attention to the balance of nature.
| A．at | B．in | C．for | D．With |
You should study the details of the policy________ before you sign it.
| A．in return | B．ahead of schedule |
| C．right away | D．on purpose |
Trees are good for man. We can’t plant them ______ many.
| A．so | B．such | C．too | D．enough |
—I saw Mr. Black on the playground this morning.
—You ________. He’s still on holiday in Sanya.
| A．can’t | B．couldn’t have |
| C．mustn’t have | D．needn’t |
The officer commanded that everyone passing by________ that day.
| A．being searched for | B．would be searched |
| C．be searched | D．must be searched for |
We ________ him to give up the plan, but he turned a deaf ear to us.
| A．persuaded | B．tried to persuade |
| C．suggested | D．did persuade |