Experiment of this kind______in both the US.and Europe well before the Second World War.

A.have conducted

B.have been conducted

C.had conducted

D.had been conducted

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Many people know that rubbish is a big problem on planet Earth What many people don’t know that junk has become a problem in outer space too.
According to BBC News,there are more than 22,000 pieces of space junk floating around the earth.And these are just the things that we can see from the surface of the earth by telescopes.There are also millions of smaller pieces of junk that we can’t see.
Objects,like bits of old space rockets or satellites,move around the planet at very high speeds fast that even a very small piece can break important satellites or become dangerous to astronauts.If the tiniest piece of junk crashed into a spaceship,it could damage the vehicle.
To make things worse,when two objects in space crash,they break into many smaller pieces.For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces,increasing the amount of space junk.
To reduce additional space junk,countries have agreed that all new pace tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere after that time In the upper parts of the atmosphere,it will burn up.
Many scientists also suggest different ways to clean up space junk.In England scientists are testing a metal net that can be fired into space junk.The net catches the junk and then pulls it into the earth’s atmosphere to burn up.The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.
“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,”says Marco Castronuovo,an Italian space Researcher.
“The time to act is now.The longer we leave the problem,the bigger it will become,”he says.

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Welcome to Beverage(饮料)2013
The China International
Drinks,Beverage,and Techniques Exhibition 2009May 28-June 1,2013,Beijing
The exhibition,sponsored by China National Food Industry Association,Institute of Scientific Technical Information of China (ISTIC)and China Central Television(CCTV),is located in Beijing International Convention Center(BICC).The exhibits include drinks,beverage,drink-making techniques,equipment and packing.
Main Activities:
seminar,technical exchange and news release
V televising for 150 minutes by radio and newspapers
Trade orderings of the senior officials of the government
Expert appraisals(评估)
Address of the organizing committee:
The institute of Scientific Technical Information of China (ISTIC)
15 Fuxing Road,Beijing 100038,P.O.Box 3827
Tel:0086-1-85140022
Fax:0086-1-85140252
Persons to contact:Mr.Cao Zhouhua,Mr.Cui Shijing
The exhibition begins on ___46___ and lasts for 5 days.
The location of the exhibition is ___47___.
The exhibition is sponsored by ___48___ organizations.
49______ drink-making techniques,equipment and packaging are exhibited in the exhibition.
The organizing committee of the exhibition is ___50___.

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我们应该有远大的志向，不应该安于现状。

A.We should have great ambitions and should not be content with things as they are.

B.We are so greatly ambitious that we are not satisfied with things as they are.

C.We should have great ambitions if we want to be content with things as they are.

D.We should have great ambitions and should not be satisfied for things as they are.

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Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions.This charming and telling use of words is what we call literary style.Above all,the real poet is a master of words.He can convey his meaning in words which sing like music,and which by their position and association can move men to tears.We should therefore learn to choose our words carefully and use them accurately,or they will make our speech dull.

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说明：我是工程部部长林宇，向董事会提交一份请示：
1.我工程部承接了一个于2018年10月启动的“光明工程项目”;
2.我部承接项目以来，项目部到工地距离不断扩大；
3.我部每天使用运输车运输货物到工地；
4.我部唯一的一台车经常抛锚，故经常租车，每月租金一万元；
5.为此我部想申请50万元经费购买两台型号为DC-10的工程运输车；
6.以上请示，请予批准；
7.申请时间：2019年1月14日。
Words for reference:
工程部：Department of Engineering
董事会：Board of Directors

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