A．Not  | B．Doesn't | C．Don't | D．Aren't |
| A．they | B．them | C．we | D．she |
| A．It means you must keep from the grass |
| B．It means you must keep off the grass |
| C．They mean you shouldn't keep off the grass |
| D．They mean you should keep from the grass |
A．needn't  | B．mustn't | C．can't | D．may not |
| A．looked at；see | B．looked；look | C．looked at；looked | D．looked；see |
| A．get | B．visit | C．listen | D．look |
| A．arrive at | B．get to | C．reach | D．arrive |
| A．to swim |
| B．swim |
| C．swimming |
| D．swam |
| A．look |
| B．listen |
| C．listen to |
| D．look to |
| A．to have |
| B．have |
| C．has |
| D．having |
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