---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
---______ is the beef? ----Sixty yuan a kilo. ______ would you like?
There ________ traffic jams in the air in the 2150s.
People often lose things when they are in _______ hurry. A. 不填 B. the C. a
---What can I do for you? ---____________.
It’s a bad habit to ______ what you can do today until tomorrow.