Is this Tommy’s suitcase?— No, it is not . It is .

Who taught ________ to write the computer programs? —Nobody. She learned it by __________.

I won’t go to Yukio’s birthday this Saturday evening. — If you don’t, ______. [ ]

That is ____ bag. But this is ____ .

There will be a stamp show in the museum ______ we visited last week. [ ]