1 . At that point,______________(strike) that I was wasting my time.
在那一刻，我突然意识到我是在浪费时间。

2 . I was told that there were about 50 foreign students studying Chinese in the school, most of ________ were from Germany. （用适当的词填空）

3 . 只有当学会与自然和谐共存的时候，我们才不能成为野生生物和地球的威胁。
Only when we learn to exist in harmony with nature ________ ________ stop being a threat to wildlife and to our planet.