his body and soul to bringing up-to-date technology and international attention to China’s AIDS problem, Dr. Pavid Ho, born in Taiwan, spent little time with his family.
30.How long do you think it will be _____ we can find a new water source?
29.High up in the mountains _____ a quiet small village, with only 20 households.
28.A heavy snow promises a good harvest, _____ is often the case.
27.After his wife died, he kept himself _____ from other people and the outside world,
26.— Why is little Jimmy so naughty today? — He is bored, so he _____ a little silly.