Dưới đây là các từ thích hợp để điền vào chỗ trống:

4. This girl is not so beautiful as that girl.
- This girl is **less beautiful than** that girl. (beautiful)
- That girl is **more beautiful than** this girl. (beautiful)

5. Mr. Long is 45 years old. Mr. Khang is 50 years old.
- Mr. Long is **younger than** Mr. Khang.
- Mr. Khang is **older than** Mr. Long.

6. This math problem is not as difficult as that one.
- This math problem is **easier than** that one. (easy)
- This math problem is **less difficult than** that one. (difficult)
- That math problem is **more difficult than** this one. (difficult)

7. The supermarket has air-conditioner. The traditional market does not.
- Shopping in the supermarket is **more comfortable than** in the traditional market. (comfortable)
- Shopping in the traditional market is **less comfortable than** in the supermarket. (comfortable)