–What time were you supposed _______?–At six o’clock. But I arrived at six thirty.

 —We can use QQ to communicate with each other online. —Good. Will you please show me         ?

Mike was late for class, so the teacher made him         at the back of the         classroom.

—Why don't you go out to play, Rose? —I'm afraid I can't. I have much homework ________.

The old radio requires____________, so you’d better have it ______soon.