1 . 社交活动通常防止老年人孤独。
Social activities usually ___________.

2 . 伊斯坦布尔是土耳其过去的首都。
Istanbul was ____________ of Turkey.

3 . 只要你坚持下去，你梦想成真的那一刻一定会到来。
So long as you stick to it, the moment ________ will definitely come.

4 . 比尔说他在中国参观的第一个地方是故宫博物院。
Bill said that ________ was the Palace Museum.

5 . 伟大的人物都能从最少的错误中吸取最多的教益。
Great men are those ________.

6 . 如果星期六晚上有一场精彩的足球比赛怎么办？
______on Saturday night?

7 . 既然你已经满十八周岁了，你就应该自己做一些决定。
____________, you should make some decisions by yourself.

8 . 21世纪目睹了人类社会的飞速发展。
____________the high-speed development of human society.

9 . 我第一次到这座小镇就被它的美丽深深吸引了。
____________, I was deeply attracted by its beauty.

10 . 每当有客人来访，给他们沏杯茶是最基本的社交习俗。(动词不定式作主语)
It is a basic social custom ___________to them whenever guests visit.