完成对话。
Millie: Hi, Sandy, 1 you _____ (start) your history project yet?
Sandy: Yes. I 2 (look) on the Internet to get some ideas, but I 3 (not write)
the report yet.
Millie: What 4 you _____ (decide) to write about?
Sandy: I want to write about Tianjin. 5 you _____ (be) there?
Millie: Yes. I 6 (go) there with my family last year. I think Tianjin 7
(not change) much.
Sandy: I think there 8 (be) some changes. I 9 already _____ (learn) a lot
about the history of that city.
1. Have started
2. have looked
3. haven't written
4. have decided
5. Have, been
6. went
7. hasn't changed
8. have been
9. have learned / learnt