He was _________down for several days after he heard the bad news .
It was believed that things would get worse, but ____ it is they are getting better.
—What field will your son go into after graduation from Nanjing University? —I’m not quite certain, but he ____ a good teacher of English.
The students spent as much time getting trained as they ____ studying.
$100 a month could hardly ____ the cost of his life in such a big city in this country.
This problem may lead to more serious ones if ____ unsolved.