—Must we finish the project in a month? —No, you _______. A. mustn’t B. needn’t C. can’t
— Do you often help your brother with his English? — No. He learns English by .
Mike prefers to .
We brush our teeth twice a day.
Xu Xia and her teammates are _______ the USA next week.
—I had a headache. I can’t sleep. —_______