Choose the correct item. 1. You can’t / shouldn’t buy any product you don’t really need....

Question

Choose the correct item.
1. You can’t / shouldn’t buy any product you don’t really need.
2. He wastes so much energy; he ought/has to at least switch off the light when he leaves the room.
3. I must/ can’t do something to help the environment but I don’t know what.

Answer 1

1. shouldn't
2. ought
3. must