Many people agree that_______ knowledge of English is a must in ______international trade today.
She often helps the students __ ___ she thinks are not good at English.
—Could I borrow your camera tomorrow? —I don’t think you need it, because visitors ______ to take photos there.
After the equipment was introduced; they produced_______ machines this year as the year before.
College students should be encouraged to use _____ Internet as _____ resource when planning a term paper.
There is n’t any difference between the two.I really don’t know __________. A.what to choose B. which to choose C. to choose what D. to choose which