4. Minh looks younger than Nam

-> Nam looks ............................................................

5. No restaurant in the city is better than that one.

⇨ That restaurant is …………………

6. This watch is worse than that one.

⇨ That watch isn’t  ………………….…

7. If Henry doesn’t pass the exam, his parents will be sad.

=> Unless .......

8. If he leaves soon, he won’t miss the train.

=> Unless ............