—Must I take the medicine every day?—No, you _______.A. must B. mustn’t C. needn’t
Not everyone knows_____they want to be.
Science is _____ difficult for some students ____ learn, so many of them don’t like it.
---What are you doing?---I’m_____my English book.
For your health, you should eat_____vegetables and_____meat.
_____students went there.