Shirley ______ a book about Tibet last year, but I don’t know whether she has finished it.

To everyone’s surprise , Alex _____ play chess very much when he was only four .

--When      your mother       you that computer?---Oh, I have forgotten.

Have you finished you work  ? Yes, I have finished it  . I finished it    1 hour ago. 

One of the students __________ good at ________piano.