1. I'm not very good ____ mathematics.

2. What are you interested ____ ?

3. Please, put your homework ____ my desk.

4. It takes about five minutes to walk ____ the bridge.

5. I took the train ____ Dover to Ostend.

6. David was very busy ____ the afternoon.

7. Toshio is ____ Japan. He isn't American.

8. Bob ran 100 meters ____ 11 seconds.

9. They arrived ____ plane.

10. "Did they come ____ bus ?"
No, they came ____ foot.