____(when/while) i sleep,the earthquake _____(happen)

____(when/while) i sleep,the earthquake _____(happen) I was doing some shopping ____ I saw my old friends yesterday afternoon (when/while/as) ____ I was falling asleep,there was a loud knock on the door.(when/while) Perhaps the day will come ____ people will be able to breathe clean air in city.A.when B.while CPerhaps the day will come ____ people will be able to breathe clean air in city.A.when B.while C.as D.since.He’s the man ______ I supposed was capable o 下面句子中的空应该怎么填1：While my wife ____(work) in the kitchen,I ____ (sit) in the garden.2：When my wife ____(work) in the kitchen,I ____ (sit) in the garden.-----1：worked;was sitting 或was working;sitted 或则was working;was s I wrote down something about the visit to the Bird's Nest ____ memories were still fresh.答案给的是B.while ,A.when 为什麽不行? I arrived at the airport ____ the plane had taken offA.after B.while C.before D.when ____ she came in,i was writing a letter A when B while C since D where the train was gone ____ I got to the railway stationA after B when C before D while i was in such a hurry that i burnt my hand ____ i was cooking breakfast这里为什么不填while而是填when 呢 When he gets tired,he ____(sleep)for a while Tom's mother said that he was out when I visited him同义句Tom's mother said that he wasn't ____ ____ when I visited him 英语翻译I have no idea when ____ ____ ____ ____ . 每当想起我小狗的死,我就很伤心（中译英）When I ____ ____ my dog's death,I ____ very ____. while he yan was at the doctor's,I was going to the class这里为什么不用WHEN ______Sarah was at the barber's,I was going to class.答案是while,为什么when不可以 I left my wallet in the restaurant .Could you please wait ____ i go back to get it为什么答案是while啊?应该是when把 When I got to McDonald's,there were notany dolls.When I got to McDonald's,the dolls were ____ ____.(1)When I got to McDonald's,there were notany dolls.When I got to McDonald's,the dolls were ____ ____.(2)Predicting the future can be difficult and emb