11. My sister _____ Beijing three times.

　　 A. has been in　 B. has been to　 C. has gone to　 D. has gone in

10. How long has Kate ______ at this school?

　　 A. studied　　 B. arrived　　 C. come　　 D. gone

9. Mr. Brown has traveled by train _______ about a week.

　　 A. since　　 B. for　　 C. after　　 D. in

8. How many Chinese words have you learned since you ______ to China?

　　 A. came　　 B. have come　 C. have been　 D. come

7. Mr. Black has taught in our school _________.

　　 A. ten years ago　 B. before ten years　 C. since ten years ago　 D. since ten years

6. Everyone should try his best to keep our environment ________.

　　 A. cleaning　 B. cleans　　 C. clean　　 D. cleaned

5. The Smiths _______ China for three years.

　　 A. has been in　 B. arrived in　 C. have come to　 D. have lived in

4. The scientist has written a book _____ the environment.

　　 A. in　　 B. on　　　 C. to　　　 D. with

3. How long has your brother ______ the league?

　　 A. been in　 B. been to　 C. joined　 D. joined in

2. How many animals ________ so far?

　　 A. have been died　 B. have been dead　 C. have dead　 D. have died