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.
