1.This supermarket is less expensive than the one across the street

2 The E teacher  has taught at our school for three years

3 My doctor said to me not to eat in front of the television

4 If you study harder, you will pass the exam

5 Hanoi surburban areas is not as noisy as its urban districts

6 How about going to ...?

7.Sarah had difficulty in learning to ....

8 The book was too complicated for us to understand

9 Sandy studied more deligently in the past than she does now

10 The first books were printed by the Chinese more than thousand years ago