1 . The flat terraces catch the rainwater and prevent the soil from________.(被冲走)(根据汉语提示完成句子)

2 . 如何处理塑料垃圾已经变成一个严峻的问题。
The problem of ______ ______ waste plastics has become a serious one.

3 . 下列各句中都有一处错误，错误涉及一个单词的增加、删除或修改，请按要求修改下列各句。
增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线（\ ）划掉。
修改:在错的词下画一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；2.每句只允许修改1处,多者不计分。
1. To my joy, my father has given up smoke.
2. The actor is such famous that he has many fans.
3. Some people break the law in order pay for their drugs.
4. China's moon car Tutu-2 has covered 318.42 meters on total.
5. The house was belonged to my grandfather before he passed away.