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On Saturday, hundreds of millions of people around the world will celebrate the 30th anniversary of Earth Day．More than 4, 000 organizations are planning events in almost 200 countries． 1 to be the largest environmental event in history in 2000．
Earth Day is a yearly call for people to work together to save the planet． 2 that the first Earth Day took place in the United States．Former Senator Gaylord Nelson started Earth Day because he believed few public officials were concerned about the environment． 3 to educate people about environmental issues．
Earth Day led to the passage of important laws in the United States．Those laws included the clean air and clean water acts and the creation of the Environmental Protection Agency．The environment in the United States is better than 4 ．There are stronger laws and better technologies．And more people are concerned about the issues．But there are major threats around the world．These include overpopulation, the reduction in animal and plant species and the rising temperature of the Earth．
5 that are still the most serious problems in many developing countries．The Earth’s growing population is putting more pressure on land and water supplies．The destruction of tropical forests threatens rare kinds of animals and plants．And that burning fuels, such as oil and coal, is causing a dangerous warming of the Earth． 6 that the global warming could be affecting．
A．It is not only the weather but also the increasing water levels and changing the planet’s structure
B．it was 30 years ago
C．It was on April 22nd, 1970
D．It is expected
E．It is air and water pollution
F．It is his aim
1. 我不能再听他吹嘘下去了。
I ____________________ any longer. (bear)
2. 做好计划后，他着手执行。
Having made his plan, he ____________________. (set)
3. 他昨天努力完成工作，他做到了。
He tried hard ____________________ yesterday, and he made it. ( get)
4. 电话占线，我不得不等一下。
The line was busy and I ____________________. (hang)
5. 因为他的手机出现故障，他不得不将它送修。
Since his cell-phone ____________________, he has to send it to be repaired. (order)
6. 一听到他的母亲给他打过电话，他立刻给她回电话。
As soon as he heard that his mother had ever rung him up, he _______ immediately. (ring)
7. 据说他患有与吸烟有关的重病。
It is said that he has got a serious illness ____________________. (associate)
8. 他迅速把手伸进衣袋，拿出几枚硬币。
He ____________________ and took out a couple of coins. （dive）
查看习题详情和答案>>1、我不知道这是不是因为我长久无法出门的缘故，我变得对一切与大自然有关的事物都无比狂热。
I wonder if it’s ________ I haven’t been able to be outdoors for so long that I’ve grown so crazy about everything to ________ ________ nature.
2、信不信由你，世上没有什么标准英语。
Believe it or not, there ________ ________ ________ ________ ________ standard English.
3、她给了我一个坚定的眼神——这种眼神表明她是不会改变主意。
She gave me a determined look – the kind that said she would not ________ ________ ________.
4、母亲问她穿着那多的衣物是否感到非常热。
Mother asked her whether she was very hot ________ so many clothes ________.
5、我宁愿讲实话而不愿说谎。
I ________ speaking the truth ________ lying.
6、她问我是否在前一天晚上见到他了。
She asked me whether I ________ ________ him ________ ________ ________.
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