1 . The international cooperation and applications of BeiDou Navigation Satellite System (BDS) _________ (base) on the principles of openness, coordination and sharing. (所给词的适当形式填空)

2 . 庄稼受到了这次暴风雨的严重影响，对当地的农民造成了损失。（which引导定语从句）(汉译英)

3 . 这一书法作品可以追溯到唐朝。（date）(汉译英)

5 . After listening to the scientists______had studied the problem, the government turned to the UN for help.(用适当的词填空)

6 . None of us lose heart even______we failed again. (用适当的词填空)

8 . __________________(appreciate) that Peter stood by me when I most needed it.
我一直都很感激彼得在我最需要的时候出现在了我的身边。

9 . There comes a time___________________. (定语从句)
现在进入了一个新旧交替的时代。

10 . 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。