Maintaining (维持) peace and stability of the South China Sea and the East China Sea will certainly ____ a more prosperous Asian-Pacific area.
The doctor recommended he ____ a few more days in hospital.
At school, some students are active____ some are shy, yet they can be good friends with one another.
_____ many times, he finally understood it.
Peter had intended to take a job in business, but____ that plan after the unpleasant experience in Canada in 2010.
Students should be encouraged to use____ Internet as _____resource.