Choose the correct sentences with the modals. 1. We should/shouldn’t pollute rivers, lakes and seas. 2. We can/can’t use water for cleaning/washing up. 3. You should/shouldn’t leave water/tap open. 4. People can/can’t save the Planet Earth. 5. They should/shouldn’t have a bath every day. 6. He should/shouldn’t throw litter into the rivers/lakes/seas. 7. Students should/shouldn’t regularly take care and water plant