3.　　 By the time we arrived at the airport, the plane ___.

A.　 took off　 B. has taken off　 C. will take off　 D. had taken off

2.　　 By the time we finished our homework, we ___ out to play basketball.

A.　 can go　 B. went　 C. would go　 D. had gone

1.　　 By the end of last year, the girl ___ about 300 English words.

A.　 learned　 B. has learned　 C. had learned　 D. learns

3.　　 It is difficult ________ him to do it well .

2.　　 It’s very easy _______ me to finish the job in time .

1.　　 It was wrong _______ him to take an orange without paying for it .

10. The necklace ___________ was stolen has not been found yet .

9. The building __________ we built last year is very tall .

8. Is this book the one ___________ you want to buy ? Yes, this is the very book I’m looking for .

7. I’ll give the tickets to anyone ___________ is interested in the exhibition .