用leave构成的短语的适当形式填空

1. I will thank you if you      me      .

2. Take care not to      anything useful__        .

3. Let's      here for lunch.

4. It's not easy for me to decide what to        and what to leave in.

5. It is a question         by history.

某企业预计下期财务杠杆系数为1.5，假设公司无优先股，本期息税前利润为450万元，则本期实际利息费用为( )万元。

A．100

B．675

C．300

D．150