Please read _____ so that I can hear you. 

--Excuse me，Mr. Li,_________ I close windows? It’s cold now.--Yes，you__________

  —The winner is a tall and thin boy with glasses!—Well，it________ be Mike.  He doesn’t wear any glasses.

________ people used the computer thirty years ago, but now it’s very popular.

--- Shall I tell John about it? --- No, you _____. I’ve told him already.