--When did you become a volunteer for the elderly?
-- Two years ago. I        this group since then.

If it ______ tomorrow, I will stay at home and do some cleaning.

—What ________ you?
—I lost my keys.

He ______ very busy this week, he ______ free next week .

. There ______ a meeting tomorrow afternoon.

Fish ________ without （没有）water .

—Who usually ________in your family ?
—My mother does .

It’s ten o’clock. Betty _______ piano.

Mary isn’t ________ a book.  She is ________ TV.

Mr. Black often _______ to the cinema on Saturday evenings .