=>
II/
1. Battle veterans or members of their families.
2. No, they don't.
3. Because Dien Bien Phu is only 30 kilometers from Laos border.
4. They depend on both tourism and trading.
D/
I/
1. If you didn't live so far away, we would visit you very often.
2. Ann asked me how long I stayed there.
3. The National Stadium will be opened next Sunday.
4. I wish I had a lot of pen pals.
5. The children who are playing there are lovely.

IV/
1. She usually goes to school by bike.
2. We haven't seen each other for 5 months.
3. What would you do if you were me?
4. Mr.Bill used to go swimming when he was young?
5. I suggest that your company should employ more qualified staff.