---- You should be _______ careful when you take the chemistry exam.---- I agree. In this way, I will make _______ mistakes.
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, must B. needn’t, must C. needn’t, mustn’t
—Must we keep the window________ all the time? —No, you don’t have to. A. open B. opened C. opening
James is ________ boy. A. a 18-month-old B. an 18-months-old C. an 18-month-old