—What do you think of teaching,Bob?—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
170. The girl has fallen off her bicycle, and her knees _________.
169. ____________! It's time to go to school.
168. In the past, the poor people often _____ hungry. So many of them died ___ hunger.
167. At this very moment, I _____ you had a very pleasant marriage.
166. I think your bookshelf is too high. I can’t reach a book on top even when I _____ my hand.