We _______ talk loudly when we see the sign “ Be quiet ”on the right.
| A.must | B.mustn’t | C.need | D.needn’t |
—Jim, ________ you answer the last question?
-- Sorry, I can’t. It’s too hard.
-- Sorry, I can’t. It’s too hard.
| A.need | B.may | C.must | D.can |