Behind my apartment, there is used to be a dirty and 1.
messy er. Bits of plastic bags hanged on the trees. 2.
Broken bottles were left laying here and there. There was 3.
a damaging car in the center. The whole er gave off an 4.
unpleasant smell. One year ago, we decided to turn it in a 5.
beautiful park. Since then, great changes have been taken place 6.
in that er. All the rubbish have been cleared away. Flowers 7.
and young trees have planted all over. Now birds e 8.
here to sing, children e here to play, and adults e here 9.
to enjoy our peaceful life. It has taken on a new look. 10. 1. 去掉is。
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(答案→)1. 去掉is。
解析：
1. 去掉is。根据下文是“曾经有一位……”，所以用there used to be…。
2. hanged改为hung。因为hang作“悬挂”解，是不规则动词，其过去式是hung；作“绞死”解，才是规则动词，过去式是hanged。
3. laying改为lying。此句是leave…doing…(让……处于某种状态)的被动式；表示状态的“在、位于”，用lie，其现在分词是lying；而laying 是及物动词lay(放置)的现在分词。
4. damaging改为damaged。因为car与damage是被动关系，所以用过去分词作定语。
5. in改为into。因为表示“把……变成……”是用短语turn…into…。
6. 去掉been。因为不去掉been, 就是被动语态了，而take place是不及物动词，无被动语态。
7. have改为has。因为主语rubbish是不可数名词，所以谓主用单数。
8. 在planted前加been。因为谓语动词plant与主语是动宾关系，要用被动语态。
9. 此行正确。
10. our改为their。因为在此指代的是adults。