Joan stood outside a shopping mall for a long time, as if ________ somebody.
| A．to wait for | B．waiting for | C．waited for | D．having waited for |
When Alice came to, she did not know how long shethere.
| A．had been laying | B．has been lying | C．was laying | D．had been lying |
It rained heavily in the south, serious flooding in several provinces.\
| A．caused | B．having caused | C．causing | D．to cause |
Wehave bought so much food now that Tom won’t be with us for dinner.
| A．may not | B．needn’t | C．can’t | D．mustn’t |
I feel so excited！At this time tomorrow morning Ito Shanghai.
| A．will fly | B．will be flying | C．will have been flying | D．am flying |
House prices vary from place to place and are usually highthere are famous schools.
| A．where | B．since | C．when | D．whether |