There is _____ river at the foot of the mountain(山)._____ river is dangerous.
Mr. Wang often says to her child, “You _______ play with fire(火). It’s dangerous.A. mustn’t B. had better C. needn’t
—Could you please ________us some stories? —OK.A. say B. talk C. tell
My uncle says that it’s his duty ________the patients.A. save B. to save C. saving
As we know, ________ is good exercise and it is necessary for health.A. walk B. walks C. walking
—Must I finish my homework before I go home?—No, you ________. But you ________ finish it before tomorrow.A. mustn’t, mustB. needn’t, must C. needn’t, mustn’t