1. You must do your homework before going to school.
2. You must be present at the class discussion on Sartuday.
3. Tokyo is the largest of the three cities.
4. We mustn't throw rubbish.
5. How many apples would she like ?
6. It is easy to learn how to use a computer.
7. He is a careful driver.
8. Students at our school do a lot of outdoor activities.
9. I have difficulty in finding a better solution to that problem.
10. Lan has two younger sisters.