Zhong Nanshan, the famous medical scientist, has devoted most of his life ________ useful ways in treating cough diseases.

Xiao Wang, ________ will it take to fly to Beijing—About three hours.

Some students were late for class because they hadbeen _________ by the heavy storm.

We were astonished __________the templestill in its original condition .

Tom, what a pity. I almost succeeded yesterday.—I told you to be careful before. ___________