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. Well, that’s enough. ______ price will be beyond my reach.
A. The higher B. A highest C. The highest D. A higher
22. —Mum, I’m feeling nervous.
— To take a deep breath will ______.
A. calm B. change C. work D. count
23.The physics problem remained confusing to the boy although ______ over and over.
A. explaining B. being explained C. explained D. having explained
24. When people talk about the most popular new Chinese Internet word in 2010, the first ______ comes into their
