补全对话。
Tom: I heard that it was your grandpa's seventieth birthday yesterday. You went to his home with your mother.
Tim: Yes. To my surprise, I saw great changes in my grandpa's family.
Tom: Really? What happened in your grandpa's family?
Tim: 1 . But now he has become better and better because of giving up smoking.
Tom: Oh? You should feel very happy. What about his house?
Tim: 2 . But now it is used to build a rearing pond.
Tom: How is the' pond?
Tim: The pond is nice and deep. 3 .
Tom : Anything else?
Tim: 4 , but now they were cut down, and they're used for making things.
Tom: What great changes! You should be proud of these changes.
Tim : Yeah.
A. Behind his house there used to be some old trees
B. Many kinds of fish are living in it
C. My grandpa used to feel weak
D. There used to be a pool with nothing in it in front of his house
1. 2. 3. 4.