Since nobody gave him any help，he________have done the research on his own.
| A．can | B．must |
| C．would | D．need |
Sam _____ some knowledge of the computer just by watching others working on it.
| A．brought up | B．put up | C．set up | D．picked up |
----- How did you do in the test ?
----- Not so well. I ______ much better but I misread the directions for Part D.
A. could have done B. could do C. must have done D. should do
Maintaining (维持) peace and stability of the South China Sea and the East China Sea will certainly ____ a more prosperous Asian-Pacific area.
| A．contribute to | B．respond to | C．belong to | D．appeal to |
So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety.
| A．must not | B．should not | C．need not | D．cannot |
The suggestion, ____ by the locals, proved to be a very constructive one.
| A．put down | B．put forward | C．put out | D．put off |