C. Complete with must/have to, mustn't or don't have to.1. We- pay an entrance fee. The computerfair isn't free.2. I'll tell you a secret, but youtell anyoneOK?3. Don't leave your rubbish on the beach. We- keep it clean.4. Youtake the dog for a walk now. I'll doit later.5. Don't throw popcorn in the water! The sign saysthat wefeed the fish!
We have to pay an entrance fee. The computer fair isn't free.I'll tell you a secret, but you mustn't tell anyone, OK? Don't leave your rubbish on the beach. We must keep it clean. You don't have to take the dog for a walk now. I'll do it later. Don't throw popcorn in the water! The sign says that we mustn't feed the fish!