一、
1. teeth
2. shouldn't
3. brushes
4. right
5. illnesses
6. us
7. me
8. she
9. they
10. he

二、
1. B
2. C
3. C
4. C
5. A

三、
1. C
2. B
3. C
4. A
5. A
6. B
7. B
8. A
9. C
10. A

一、
1. teeth
2. shouldn't
3. brushes
4. right
5. illnesses
6. us
7. me
8. she
9. they
10. he

二、
1. B
2. C
3. C
4. C
5. A

三、
1. C
2. B
3. C
4. A
5. A
6. B
7. B
8. A
9. C
10. A