There is _______ “i” in the word i phone .
There is _____ “s” and _______ “c” in the word “school”.
Will the _________ of English last long?
—Can you play ________ guitar?—Sure. It’s a piece of cake for me.
―It's nice day , isn't it?―Yes,what fine weather!
I don’t think ______ 18-year-old boy is serious enough to drive.