when is the meeting supposed to start?It is __.A.about to be

when is the meeting supposed to start?It is __.A.about to be when he is supposed to start work.翻译成中文 This is a detect SM,It supposed to be invisible Now it is ( ) .The show is about to start.A.f 改同义句：He is supposed to be back at the meeting by seven. 请问it is not the bad thing it is often supposed to be该怎么翻译! the race is about to start 英语翻译it is a great relief to be able to talk to you about the -----there------some people to the meeting tomorrow? a.Is;be The place___ the bridge is supposed to be built It is difficult to start a (). The train is about to start.这里用about干什么?