The flu is believed ____by viruses that like to reproduce in the cells inside the human nose and throat.
We went right round to the west coast by_______ sea instead of driving across _________continent.
The old man wants to see the great changes in our country, and I am sure he will ________.
After introducing the new technique, the automobile factory produced ________________ cars in 2010 as the year before.
_____________ made Jim most excited was, I think, ____________ he had passed all the exams.
The living room is clean and tidy, with a dining table already_____________ for a meal to be cooked.