I hope you don’t mind me asking, ____ where did you buy these books?

A. so             B. yet             C. but            D. and

 To save class time, our teacher has ____ students do half of the exercises in class and complete____ for homework.

A. we; the other half    B. our; other half    C. us; the other half    D. us; others

 ---What are you busy doing these days?

---____ the college entrance examination.

A. Preparing for    B. To prepare for

C. To be preparing for    D. Prepared for

Everybody believes he will be the winner of the 100-meter ____.

A. competition       B. match         C. contest         D. race

Helen said that she would come to see me the next day, but she_____.

A. wouldn’t         B. hasn’t         C. hadn’t          D. didn’t

 Imagine how excited we were ____ that our schoolmates had been admitted to some famous universities.

A. learning      B. having learned      C. to be learning     D. to learn

 ---­­­So you missed the meeting.

---­­­____. I got there ten minutes before it finished.

A. No problem  B. Not really    C. You bet             D. Forget it

 Although Rose is very busy, she still ____ a lot of time to her students in her spare time.

A. spends         B. provides          C. devotes         D. offers 

 Our school has about 100 computers, but only sixty percent ____ used regularly.

A. is               B. are               C. was           D. were

 ---Did Tom come back late last night?

---No. It was not yet 8 o’clock ____ he arrived home.

A. before            B. when            C. that           D. until