Here are the correct options for each blank in the first part, followed by the matched situations and advice in the second part:

### Part III: Choose the correct option

1. **a**
2. **the**
3. **an**
4. **the**
5. **an**
6. **the**
7. **the**
8. **the**
9. **the**
10. **the**

### Part IV: Match the situations with the suitable advice

1. Your sister is suffering from a headache. - **C.** You should take a panadol.
2. Your brother is making noise at the pagoda. - **A.** You should be quiet here.
3. Your foreign friend has been invited to dinner in a Vietnamese house. - **D.** You should wait for the host to start eating.
4. Your cousin is chewing and talking at the same time. - **E.** You shouldn’t do that. It’s not very polite.
5. Your mother has a terrible backache. - **F.** You shouldn’t lift heavy things and take a rest in bed.
6. A passenger is smoking in the public area. - **B.** You shouldn’t smoke here.

Feel free to ask if you need further assistance!