英语选择5.If we don’t start out now,we must risk ______ the trai

1.if we don't start out new,we must risk____the train. if we don't start to protect bats,they will d___ out in the we don't know when ______ (start) We must start to do the work right now____we don't have enou So even if our plans don't work out in the way we ____,we sh So even if our plans don't work out in the way we hope ,we s --"we must start for the work now." ---so must we" 为什么这里的回答用 If we don't do that ,there must be someone ______ do it for 英语.单项选择单项选择（ ）1.If we don't the factory from _____the air,th Must we clean the classroom now?No,you needn't.It ______ aft I don’t know when we shall start the work. Will the water dry out if we don't heat it?Why?回答问题不是翻译.