题目内容：

根据句意，用括号中所给词的适当形式填空。（共5小题，满分5分）

1.How ______________(care) you are! You’ve knocked the cup off the table again!

2.Don’t be afraid of making __________. They help you learn. (mistake)

3.Tom thinks people will help him if he asks for help         (polite).

4.The _______ (nineteen) World Book Day was on April 23,2014.

5.It’s very  __________for us to study in group. (help)