1. were

2. lived; has visited

3. did you go to the dentist last week,Nam?; went

4. didn't visit; catched

5. flew; taked; bought

chuc bn hoc tot!!!

1. because he had an awful stomache

2. yes,he did

3. yes,he did

4. the dirt can make people sick

5. the doctor gave Nam some medicine to make him feel better

học tốt nhé!!!