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.