用所给单词的适当形式填空。
1. This is an interesting book _____ (write) by Shakespeare.
2. Gina was my best friend when l was a kid, but _____(not see)her since
2002.
3. -How long have you been _____ (study) English?
-For five years.
4. The twins _____ never _____ (play) computer before, so they are so
excited.
5. -How long _____she _____(live)in Shanghai?
-Since the end of last year.