.The profit of the company fell _______ in the first three months in the year 2009 as a result of the global economic crisis.
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.