() 4. We mustn't go into the teachers’ office without  the door.

   A. knock on

   B. knocked on

   C. to knock

   D. knocking on

() 3. I    900 English words by the time I was ten.

   A. learned       B. was learning

   C. had learned   D. learnt

() 2. We were about   to school when it began to rain.

   A. going   B. go

   C. went    D. to go

Ⅲ.单顶选择

() 1. In America,people start celebrating the New Year   December 31st.

   A. in   B. at

   C. on   D. for

5. The dog has injured but it is still .

3. I  confidence for myself.

4. By the time I got to school,I found I  my homework.

2. When she  the cinema,she told me she had lost her ticket.

1. It's impolite to ask a woman's age in many  countries.

5. The plane flew   (在........ 上方) the clouds.

4. I like to eat apple  (果馅派).