---All the building materials have been washed away.---So I have heard. But there was no sign ______ a heavy rain was on the way last night.
--May I open the window to let in some fresh air? -- __________
__________ is even more important is _________ the earth cooled down, water began to appear on its surface.
If you ______ smoke, please go outside.
His eyes stare _________ is left of the brother’s dinner on table.
He could not ________ Yong Hui ___________ telling people lies.