My friend, who ________ on the International Olympic Committee all the time, is retiring next month.
| A．served |
| B．is serving |
| C．had served |
| D．has served |
I’ve already told you that I’m going to buy it, ________.
| A．how much does it cost | B．no matter how it costs |
| C．however does it cost much | D．however much it costs |
As high school students, it’s very important to keep ourselves ______ of what’s happening home and abroad every day.
| A．to inform | B．informing | C．informed | D．be informed |
In order to protect the environment, supermarkets and stores are forbidden to ______ free plastic bags to shoppers..
A. put away B put off C. give off D. give away
Believing that everyone can make _____ world _____ better place on a daily basis, Tom plays his part in helping others.
| A．/, a | B．the, / | C．the, a | D．the, the |
---- What do you think made Mary so upset ?
---- __________.
| A．As she lost | B．Lost | C．Losing | D．Because of losing |