从每题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. Seeing the happy ________ of children playing in the park, I’m full of joy and confidence in the future of our country.
A. sight B. view C. sign D. scene
22. It is good ________ for an Arab to stand ________ his friend when they are talking.
A. manners; close to B. manner; close to
C. manners; closely to D. manner; closed to
