III
1. activities
2. favorite
3. group
4. rehearsing
5. calebrations
6. collector's
7. about
8. American
IV
1. What are you going to do this summer vacation?
2. Why did Hoa go to the dentist last week?
3. Everyday I get up early to do morninge exercises
4. He us hungry so he has to find something to eat

IV
1. Maire was born is Pland in 1867
2. Yes, she did
3. Yes, she was
4. She won th Nobel prize for Physics in 1903
IV
1. It always takes Hoa's younger brother 2 hours to do his homework every evening
2. There are nine hundred and forty-five stamps in Mr.Vinh"s collection
3. What is the length of Mekong river?
4. My sister runs quickly
5. I prefer waking to cycling