In the Olympic Games all athletes should play fair ________ the rules, but some often take drugs to accomplish their aims.
| A．with | B．for | C．against | D．by |
Do you know that _______ with wise men improves your mind?
| A．chat | B．chats | C．chatted | D．chatting |
As is known to all, oranges are _______ Vitamin C.
A. rich in B. poor with
C. short of D. good for
We’ll do ________ the Party calls upon us to do.
| A．no matter what | B．whatever | C．however | D．whenever |
If you try to learn too many things at a time at the beginning, you may _______.
| A．have confused | B．have to be confused |
| C．get confused | D．get confusing |
The war made _______ impossible for the scientist to go on with his research.
| A．him | B．it | C．this | D．that |