4 5 6 7 I don't have to use my car every day. We should/ought to/had better cycle to school. You shouldn't leave the tap running when you're brushing your teeth. We must try to save energy at home and at work.

1. I don't have to use my car every day.
   • B It's not necessary/obligatory.
2. We should/ought to/had better cycle to school.
   • G It's the best/right thing to do.
3. You shouldn't leave the tap running when you're brushing your teeth.
   • D It's not a good idea - I don't recommend it.
4. We must try to save energy at home and at work.
   • A it's important for you to do so.

Ответ: 1-B, 2-G, 3-D, 4-A

Отличная работа! Ты уверенно двигаешься вперед, и это здорово!