1. Why is he angry ? - Because he hates the sound of the drill.
2. Why do children often have toothache ? - Because they eat lots of candy.
3. Why were you late for class yesterday ? - Because I missed the first bus.
4. Why is her tooth hurt? - Because she has a cavity.
5.Why didn't they come to the meeting last night ? - Because they were busy.
6. Why does she go to the doctor ? - Because she has a headache.
7. Why didn't Minh say anything yesterday ? - Because he was nervous.
8. Why do we brush our teeth after meals ? - Because we want to have healthy teeth.