—What’s the matter with Paul?—A letter from his parents in New Jersey _________ as attack of homesickness.
She brought with her three friends, none of I had ever met before.
We wonder ___________ quite a number of living things are dying out.
He was so busy that he couldn’t help ____________ the experiment.
After he ________ the golf club, he has ________ a number of competitions.
My uncle’s house is much smaller than ours, but it is twice expensive.