| A．make into |
| B．make of |
| C．be made of |
| D．be made into |
| A．to pollute |
| B．pollute |
| C．polluting |
| D．to polluting |
| A．when |
| B．where |
| C．if |
| D．then |
| A．look | B．hear | C．see | D．listen |
| A．luckily | B．lucky | C．luck | D．unlucky |
| A．cleans |
| B．clean |
| C．cleaning |
| D．cleaned |
| A．with | B．at | C．after | D．before |
| A．one largest |
| B．one of the largest |
| C．one the largest |
| D．one of largest |
| A．play |
| B．to play |
| C．plays |
| D．playing |
| A．is |
| B．are |
| C．has |
| D．have |
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