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1. This supermarket is less expensive than the one across the street.
2. The English teacher has taught at our school for three years.
3. My doctor said I oughtn’t to/ shouldn’t eat in front of the television.
4. If you don’t study harder, you won’t pass the exam.
5. Hanoi suburban areas are not as noisy as its urban districts.
6. How about going to uncle Huan’s farm this weekend?
7. Sarah had difficulty (in) learning to read in Japanese.
8. The book was too complicated for us to understand.

9. In the past, Sandy studied more diligently than she does now.
10. The first books were printed by the Chinese more than a thousand years ago.