用 for 或 since填空。 1. He's been waiting fo

问题：

用 for  或 since填空。

1. He's been waiting for you ______ two hours.

2. John has been living here ______ 2008.

3. I've been staying in London ______two weeks.

4. Jack has been studying French ______ he was mine.

5. I slept only ______ two hours last night. Now I feel very tired.