用动词的适当形式填空
1.While we __(wait)for the bus yesterday afternoon,a giel __(run)up to us .
2.I __(telephone) a friend when Bob __(come)in this morning .
3.Jim __(jump)on the bus as it __(move)away.
4.While mother __(put)Cathy to bed,the door bell __(ring).
5.It was late at night George __(read)when he __(hear)a knock at the door.