2．He was walking （walk） home when the （rain）rain_begin.
3． —What were you doing（do） at ten o'clock yesterday﹖
—I was studying （studay） in class．
4．When Harry was having（have） breakfast Lily telephoned（telephone） him．
5．When I went （go） to school this morning I _saw（see） a car running into a bus．
6.This time yesterday Jack was mending (mend) his bike.
7.I was writing(write) a letter at ten last night.
8.It was six.The Greens were having (have) supper.
9.When you knocked (knock) at the door yesterday,I was doing (do) some washing.
10.While my mother was watching (watch) TV,I was making(make) a kite.