请认真阅读下面各题，从题中所给的A、 B、 C 、D 、四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
21.Canada, _______ second to Russia in size, is _______ home of all kinds of animals and plants, making it famous for its natural scenery.
A. /; a B. the , the C. the, / D. / ; the
22.—Time ________.It’s likely that we will miss the deadline.
—Don’t worry. We have already got through 80%of the job.
A.has run out B.is running out C.has been run out D.is being run out
