People ______ long distances frequently have to decide whether they would prefer to go by land, sea or air.
I know nothing about the young lady ___________ she is from Beijing.
Sandy could do nothing but _________ to his teacher that he was wrong.
__________ she couldn't understand was__________ fewer and fewer students showed interest in her lessons. A. What; why B. That ; what C. What ; because D.
Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients.
Neither of them knew what_____ was doing.