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9. Three days means  hours.

8. There are over  (五十) students in our class.

7. —What is twenty-one and forty-six?

  —It's .

6. There are  or days in a year.

5. There are three  ( 百) teachers in our school.

4. I usually r   my bike to go to school with my clavssmate.

3. My sister usually goes to work by s .

2. We go to school b   bus.

1. There are s   minutes in an hour.

() 7. —Do you eat outside?

     Yes,because I don't know how to cook.

      A. have to   B. has to

      C. must      D. can