Ответ:
- You should always be careful with candles.
- You shouldn't leave a lighted candle in an empty room.
- Dad says that we should tidy up our shoes.
- Maybe we should have a smoke alarm in the classroom.
- You shouldn't take other people's medicine.
- We should prevent as many accidents as we can.
Ответ: 1. should, 2. shouldn't, 3. should, 4. should, 5. shouldn't, 6. should