(2014·济南市名校第四次诊断性测试)—Is the letter from your mother?—Yes.But she ________the letter herself，because she doesn’t even know one word.

You'd better take a heavy coat. Sometimes it ______ be very cold.

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

Looking after very young children _____ be very annoying sometimes, but you’ll get used to it after a while.

______ I have a quick word with you? Something important has happened.