—Maria likes singing. Do you often hear her _______ after class?
—Yes, I do.
| A．sing | B．to sing | C．sings | D．sang |
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