--______you swim? -- No, I can’t.
— I’m not going swimming this afternoon. — ______. I have to help my mother do some cleaning.
— Come and join us, Betty! — I’m afraid I can’t. I’m too busy now. If I ______ time, I would certainly go.
Mike is ______, but his brother Sam is much ______.
Look! The police ______ the food onto the bank of the river.
That’s ______ brother’s shirt. It isn’t _______.