参考答案如下：
1. used to
2. is full of
3. throwing rubbish
4. being polluted
5. close down
6. play a role
7. clean up
助你愉快学习！
1. used to
2. is full of
3. throwing rubbish
4. being polluted
5. close down
6. play a role
7. clean up
助你愉快学习！
温馨提示：答案为网友推荐，仅供参考
第1个回答 2017-02-18
minute by some stroke of fortune,
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