根据句子意思及汉语提示，写出所缺的单词。

1．I passed the exam this time because my friend Tom often helped _________（我）with my English．

2．When jay Chou _________（到达）the airport，his fans clapped and screamed with joy．

3．The Lion King is such an interesting cartoon film that it is worth _________（看）a second time．

4．I can't tell you whether it's a good book or not _________（没有）reading it．

5．The local government has taken actions to reduce _________（污染）．