从Ⅱ栏中选出I栏句子的答语。
I Ⅱ
(______) 1. May I go shopping with you?
A.Oh, I see.
(______) 2. We must cross the street when the light is green.
B.Good idea.
(______) 3. May I speak to Mary?
C.Certainly.
(______)4. How about reading books?
D.I'm reading a book.
(______) 5. What are you doing'?
E.Sorry, she is not in.