III.
1. It takes me half an hour to get to work
2. It's very important to keep the environment clean
3. It's a five- floor building
4. Nam prefers staying at home to going to the zoo
5. Let's go out for dinner tonight
IV
1/
1. B
2. D
3. A
4. A
5. B
6. A
2/
1. B
2. C
3. D
4. B
5. D
6. B