If you have any trouble, be sure to call me. –__________________.

Mary, how much did you ______ the new watch —300 yuan.

I’ve read through this book several times, but I will read it ______ so as to get better understanding.

Had you joined the chat room ten minutes ago，you would have known what weabout then．

Some　old　people　don’t　like　pop　songs　because　they　can’t＿＿so　much noise．