题目内容
(用 while 或 as 填空) We were watching TV ________ my mother was cooking in the kitchen．
(用 while 或 as 填空) John came in __________ I was typing a letter．
(用 while 或 as 填空) _________ I was walking down the street I saw a police car．
(用 while 或 as 填空) __________ he finished the speech，the audience clapped their hands．
(用 while 或 as 填空) My mum was cooking __________ my dad was reading newspapers．
