12．只有当我们知晓生活是艰难时.才会激励自己努力改变人生． Only when we know that life is hard.can we motivate ourselves to chan——青夏教育精英家教网——

12．只有当我们知晓生活是艰难时，才会激励自己努力改变人生．（Only）Only when we know that life is hard，can we motivate ourselves to change our life effectively．．

11．由于缺乏资金和人力，好几条地铁的建造将推迟．（lack n．）The construction of several subways will be put off for lack of funds and labor．．

10．自从派了更多的警察在路口指挥交通，交通违章的人数大大减少了．（since）The number of people who break the traffic rules has decreased sharply since more policemen were sent to direct the traffic at the crossroads．．

9．看到明星上传的照片以后，他的粉丝们争抢着第一个去和那个邮筒合影．（strive）Having seen the photo uploaded by the pop star，his fans stribed to be the first to have pictures taken with the exact mailbox．．

8．你认为什么导致了这位年轻科学家的英年早逝？（contribute）What do you think has contributed to the scientist's death at such a young age/in his prime/the scientist's dying young？．

7．虚拟现实将会如何改变人们未来的生活还不得而知．（remain）It remains unknown how virtual reality will change people's future life．．

6．It suddenly occurred to him _____he had left his key in the office．（　　）

5．A number of major problems remain ______ about this new research project．（　　）

4．He ______ in a youth hostel for two months when he was in London．（　　）

	A．	has stayed		B．	stayed
	C．	had stayed		D．	had been staying

3．The fog was very heavy and ________ all the flights were cancelled．（　　）

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