题目内容：

用括号中词的适当形式添单词；

1.It’s a good habit to brush ___________(tooth)three times a day.

2.If there are more trees on the earth, there will be ________(little) pollution.

3.I hope to finish __________(write) my first book by the end of the year.

4.Thanks for _______(give) me so much help with my English.

5.More natural reserves(保护区) will be _________(build) in our country in the next few years.