单项填空
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. It is widely accepted that _______ beautiful is always _______ joy to everyone.
A. a; a B. 不填; the C. the; 不填 D. the; a
22. —Do you think the weather will be all right this summer?
—No, ________ we’re lucky. The newspaper says it’ll be very hot anyway.
A. if B. though C. unless D. as
23. —I want someone to write the composition for me.
—No! As a student, you _________ depend on yourself.
A. shall B. will C. can D. may
