He spent too much time talking on ______ phone while we were all busy at _____ work. A. the, 不填 B. a, 不填 C. 不填, 不填
Not believing their eyes, the visitors on the spot _______ the flying plane, doing some most difficult and dangerous tricks in the sky.
Many festivals are held _______ our ancestors for their contribution to the world.
She promised to ______ at the meeting but she didn’t ______.
In order to win back the customers, the owner of the restaurant decided to sell his food ____.
. Most smokers say they _______ smoking to some degree but health experts suggest that they had better give it up ______ their health