练习题：
21这就是近年来亚洲人口的增长率。（注意介词+关系代词引导定语从句）
That is the rate ___________ which the population in Asia has raised in recent years.(at)
22.我们如不足够努力，必将终生一事无成。
We will accomplish nothing all our life ___________ we work hard enough. (unless)
23.我们将在这所大学里学习四年。在此期间，我们要为进入社会做好准备。
We are to study in this university for four years, during which we shall prepare ___________ well for the society.(ourselves)
24.在中国的所见所闻给他们留下了深刻印象。
What they had seen and heard in China made deep impression ___________ them.(on)
25.从英国出发，又返回到英国，整个航程比以往单人驾舟航海的最远航程还远一倍多
The whole voyage from England and back was more than ___________ the distance anyone had previously sailed alone.(twice)
26.奇切斯特正是因为对合恩角感到恐惧才开始他的那次航海的。
Chichester's voyage began because he was ___________ of Cape Horn. (terrified)
27.尽管朋友们尽力劝阻，他还是再度起航了。
He set off once more in spite of his friends' attempts to ___________ him. (dissuade)
28.守时性的意思之一是：今日事，今日毕。（译法：意译）
One meaning of ___________ is that we must not put off what we can do today till tomorrow. (punctuality)
29.伊妮德尽力让她母亲高兴。
Enid made every ___________ to make her mother happy. (effort)
30.知足者以其所有为乐。
A contented person is happy ___________ what he has. (with)
31.羽毛比石头落想想此，只是因为空气对羽毛的阻力大于对石头的阻力。
Feather falls slower than a stone only because the air holds the feather back more than it ___________ the stone. (does)
32.那男孩撕下一页日历，在上面画了一串葡萄。
The boy ___________ a page from the calendar and drew a ___________ of grapes onit. (tore, bunch)
33.你要是平时努力学习，考前就不用整晚开夜车了。
If you work hard at other times, you won't have to sit ___________ all night before the exam. (up)
34.纵然有很多困难，我还是会执行学习计划的。
I'll carry ___________ my study plan even if there are lots of difficulties.(out)
35.我们如果不想淋雨的话，就得加快步伐。
We must ___________ our steps if we don't want to be caught in the rain.(quicken)
36.他根本就不喜欢流行音乐，但他还是很勉强地去听了那次音乐会。(reluctance)
He went to the concert with much ___________ though he doesn't like pop music at all.
37.要是这样危险的建议被采纳了，后果会如何？(be）
What might the results ___________ if such a dangerous proposal were accepted?
38、现有的很多问题，至少部分是由于未能交流思想引起的。（part)
Many of the existing problems are caused at least in ___________ part by failure to communicate.
39、据报道，伴随着电视机长大的这代人几乎写不出一个正确的英文句子。(barely)
It is reported that the generation growing up with television can ___________ write a correct English sentence.
40.比起在宿舍里学习来，我在图书馆收效大得多。宿舍里干扰太大了。(distraction)
I can accomplish a great more in the library than in the dormitory, where there are too many ___________ .
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