You’d better ______ to send me an e-mail when you get home. A. not to forget B. don’t forget C. not forget
--What else must we pay attention to ____ our school clean?--We must not throw any litter onto the ground.
--I think Sam is the strongest student in our class.--I agree with you, but who is the second ____ one?
Don’t be angry with your kid when he makes a mistake again, because ____ of us are perfect at all.
--Have you phoned your brother?--Yes. He ____ to be back next week.
Our teacher always tells us that lessons can be learned to face the future, ____ history can’t be changed.