Question

1. You … recycle aluminium cans. 2. You …adopt any animal in our zoo. 3. People … throw away litter in the park. 4. Humans … cut down forest to clean places for building. 5. We… reduce our oil consumption. 6. People … know more about genetically modified products. 7. Authorities … organize environmental campaign

Answer 1

1 can/should
2 can't
3 shouln't
4 have to
5 must/ should
6 should
7should