bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

You have never been to Beijing, _________— ______. How I wish to go there again!

My brother is really ____. He often works in his office far into the night. [ ]

How do you study _________ a test—I often study _______ a group．

The picture of the park memories of our class’s trip last year, when Mr. Smith began to take charge of our class.