Peter was about to unlock the door ___ he found someone had broken into the room.为什么要填WHEN,在这里是什么作用?

Peter was about to unlock the door when he found someone had broken into the I was about to Sandy likes reading.She likes to learn more about the w____ from booksMiss Xu t_____ us Chinese.I e_____ swimming in summer holidayYao Ming was b_____ in Shanghai.Peter is good ai swimming,so he is a good s_____.At I_____,I can chat with my friends u was to/was about to区别 Peter was about to unlock the door ___ he found someone had broken into the room.为什么要填WHEN,在这里是什么作用? what would Liu Tao like to know about Peter? Peter,___(tell)me something about your trip to Beijing. peter was that much to the good,anyway Mike was ----（invite）to Peter“s party急 was it difficult to make peter agree with you peter looked weak.his mother was worried about him.she took him to the doctor.hi,little boy!what'sthe matter with you?i'malways tired the doctor was friendly and he asked peter some questions.how old are you,peter?i'm twelve years old.how tall are yo How about coming to Peter's surprise party?(改为同义句)______ _________coming to Peter's surprise party? 根据短文填写信息 (英文)this morning there was a telephone call from Peter at about ten o'clock.He wanted to have a talk with my sister Lily.But Lily was out at that time.I said I could take a message for her.Peter wanted Lily to call him wh Peter was happened to be at home that day.为什么是was happened而不是happened The carpenter was about to leave. I was about to finish my work. as i was about to go peter was () second to come to school this morning.()内应该填a还是the?