补全对话（5分）
根据下面的对话情景，在每个空白处填上一个适当的句子，使对话意义连贯，完整。
(Michael and Kangkang meet at the school gate.)
A: Hello, Kangkang.
B: Hi, Michael.
A: I called you just before I left home ,but you were not in. 小题1:__________________________
B: Oh, sorry. I’ve been to the library.
A: What did you go there for?
B: 小题2:__________________________________________________________
A: Well,小题3:_____________________________________________________
B: It’s about 1.3 billion, one fifth of the world’s.
A: Has the government done anything to control the huge population yet?
B: Yes.小题4:_________________________________________________and it has worked well in controlling the population growth for many years.
A: Really? However, the population problem is still serious in China, isn’t it?
B: Yes, it is. Oh!小题5:_________________________________________Let’s go to the classroom.
Hurry. Let’s go.
A.A. What’s the population of China?
B.B. Where have you been?
C.C.What’s wrong?
D.D. The government has carries out the one-child policy.
E.E. There goes the bell.
F.F. I went there to look up some information about China’s population.
G.G.I borrowed some story books.