100. My cousin wants to be a scientist and_____ science of nuclear.

t become a serious climber until the fifth grade, ______ I went up to rescue a kite that was stuck in the branches of a tree.

Where did you find Mr. Smith? — It was in the library _____ we often went to read. [ ]

ve. This is Helen speaking!—Hi, what a coincidence! I _____ about you.

The general manager has to retire due to his illness. Who do you think will_____ the business?[ ]