Exercise 1:
1. B
2. D
3. A
4. A
5. C
6. B
7. B
8. B
9. B
10. A
11. C

Exercise 2:
1. has → have
2. at → to
3. cleans → is cleaning
4. in → at
5. When → What
6. Does → Do
7. childs → children

Exercise 3:
1. I love doing my homework
2. My sister doén't like reading magazines.
3. My dad enjoys listening to country music. 
4. My brother eats lunch at the school canteen everyday.
5. My father goes to the judo club every Sunday.
6. What often do you do on Sunday?
7. She sometimes a cup of coffee after breakfast.
8. How do you often visit her?

Exercise 4:
1. Does she like
2. Do you water
3. doesn't like
4. Are you
5. don't know
6. encourages
7. speaks
8. studies - want

Chúc bạn học tốt :)