—Listen ! Helen is singing in the next room.
It ____ be Helen. She has gone to Beijing.
| A．can’t | B．mustn’t | C．may | D．needn’t |
What the boy said sounds ______.
| A．reason | B．reasonable | C．reasonably | D．Reasoning |
I didn’t know ______.
| A．where does he live | B．where do he lives |
| C．where he lives | D．where he lived |
Mary sings English songs well and ______.
| A．Jane does too | B．either does Joes | C．so Janes does | D．so does Jane |
I mean ______ class meeting on Monday afternoon.
| A．have | B．to have | C．having | D．to having |
Beijing is one of the ______ in the world today.
| A．busiest city | B．busiest cities | C．busy city | D．busy cities |