---Is this your basketball?---   ________.

—Oh, it's so cold. We haven't had such a severe winter for so long, _______ we？—Yes, the forecast says it's going to get worse _______ it warms up.

 I have worked with children before, so I know what ______ in my new job.

You didn’t believe John won the first prize at the speech competition, ______?

—        is your sister?—She is eight years old.