用所给动词的适当形式填空。

1. Hello, I _____ (not know) you _____(be) in London. How long have you been

there?

2. By the end of last week, he _____(read) this book four times.

3. I _____ (not have) any English knowledge before I came here.

4. I _____(lose) my keys. I can't remember where I last saw them.

5. －_____you _____ (see) the film yet'?

    －Yes, I _____(see) it last week.