根据下列句子的意思及所给的汉语提示，写出空缺处单词、固定短语或固定搭配的正确形式。

1.I'm sure you can pass the exam _______ (成功).

2.It will _______ (有用的) for you to read more English newspapers.

3.Tom will come back on the _______ (第二十) of next month.

4.I really want to know who this toy car ________ (属于)

5.When I don't know what to do,my father ________ (想出) some good ideas.