根据句意及首字母提示, 补全单词, 完成句子。（每空1分，共5分。）

1.Nothing is too difficult if you put your h        into it.

2.Bill is such an h        boy that we all believe him.

3.This fruit t         sweet. Children like it very much.

4.You won’t catch the early bus u        you get up quite early tomorrow.

5.We must pay a        to English grammar when we learn English.