It seems to some experts that 56．com, youku．com and tudou．com _____ 90% of the video market in this area．

Our school has about 100 computers, but only sixty percent ____ used regularly.

______ seems to be no possibility ______ the shy girl can win the first prize in the contest

Teenagers ________ their sense of hearing because they always wear earphones.

So far, _______ of the students in our class_______ seen the film.