11. –How do you usually come to school every day?

-Sometimes _______ bike, sometimes _______ foot.

10. Do the twins look _______ their father?

9. Don’t laugh _______ others’ mistakes.

8. I couldn’t finish it _______ your help.

7. Thank you very much _______ coming to see me.

6. What’s wrong _______ your bike?

5. It’s not good to come late _______ school.

4. Before 1990 there was no airline _______ the two cities.

3. The building is ______ fire. There are some people ______ the　 top floor.

2. Which room are you going to live ______?