英语单选1._____Mary _____ in a hospital?A.Is;work B.Are;working

英语单选
1._____Mary _____ in a hospital?
A.Is;work B.Are;working C.Do;works D.Does;work
2.--Is this your pencil sharpener?--_____.
A.Yes,it is B.No,it is C.It's a book D.Yes,this is
3.This is _______ backpack._______ is over there.
A.him;Hers B.her;His C.muy;Her D.mine;Hers
4.Thank you for your help.-- _____.
A.No.thank you B.That's all right C.All right D.I'm all right
5.Let's _____.
A.go home B.to go home C.goes home D.going home