下列各句中，标点符号使用恰当的一句是（ ）

There are _____ months in a year. September is the _____ month.

They have English classes_____Monday _____ Friday.

Mother’s Day is coming. Here is a pair ofjeans for you, Mum. — ______ beautiful blue jeans!Thank you, Amy.

that you like the computer so much, why not buyone— Well, I can’t afford ______ computer at present