That be Mary． She has gone to Changsha on business． （ ）
A．can'tB．mustC．may
Where do you live， Lin Tao？
I live in Beijing now． I _____here for ten years．（ ）
A．movedB．have movedC．have been
Look! What's on the ground？
Oh， it's my sweater． Please_____．（ ）
A．pick it upB．pick up it
C．pick my sweater up
Li Wen is a normal ______boy from the countryside． He works hard and does well in school．（ ）
A．15 years oldB．15﹣years﹣old
C．15﹣year﹣old
Alice does her homework as _____as Peter．（ ）
A．carefullyB．more careful
C．careful
I think Karen should go swimming with Kate．
If she _____， she will have great fun．（ ）
A．doesB．doC．will do