2 . 在过去两年来, 我们看到了大量的湿地被人类活动破坏。
In the past two years, we________________ large areas of wetlands________ by human activity.

3 . 虽然面对很多挑战，在同学们的帮助下我在英语上取得了迅速的进步。
Though ________ with many challenges, I made rapid progress with English learning________________ my classmates.

4 . 只有我们做出共同的努力, 我们才能创造一个更和谐的世界。
Only if________________________________________.

5 . 他面对如此棘手的问题，感到束手无策。 (Such…; face)
Such _____________________ that he doesn’t know how to deal with it/what to do with it.

6 . 这些建筑有其独特的文化价值，值得研究和保护。(worth)
These buildings have their unique cultural values, so they _____________________ .

10 . Now she ______ (觉得练习说英语很有趣) and enjoys it when she can speak fluent English. (find+it+形容词+to do) (根据汉语提示完成句子)