下列各句均有一处错误，指出并改正

In 1752, Scientists already knew what electricity was.

短文改错。

此题要求改正所给短文中的错误。对标有题号的每一行做出判断：如无错误，在该行右边横线上画一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：

此行多一个词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。

此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。

此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。

注意：原行没有错的不要改。

The invention I couldn't live without is my Walkman. This was developed in Japan with Akio Morita who worked for Sony. He was keen golfer and lover of music and he wanted a light, compact machine but he could play and listen to at the same time. In 1979 his company brought out a machine but they are by no means convinced they would sell as it was unable to record. They were also very worried that buyers will find the headphone too annoying. However, the Walkman was a success and over 100 million have sold world-wide－and not all to golfers!

1．________　　2．________　　3．________　　4．________

5．________　　6．________　　7．________　　8．________

9．________　　10．________

短文改错。

此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：

此行多一个词：把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。

此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。

此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。

注意：原行没有错的不要改。

Each year, more and more things made of paper. We have had paper cups, plates and dishes for long time. But now we hear that chairs, tables and still beds can be made from paper. Besides paper boots and shoes you can even wear paper hat, paper gloves and paper raincoats. When you have use them once, you throw them away and to buy new ones. The latest things in paper seemed to be paper houses. You can put it up yourself in a few hours or you can use it for about five years.

1．________　　2．________　　3．________　　4．________

5．________　　6．________　　7．________　　8．________

9．________　　10．________

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

He A be answered B for everything that C he has done．D

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

The new A teacher,like all the B teachers, works C very hard indeed．D

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

[　　]

My English isn’t A so B good C as him．D

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

[　　]

My name is William, and A most of B my friends call C me Bill for short．D

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

[　　]

Who are A your B friends C waiting D?

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）：

[　　]

There are A two trees in the B front of C our D classroom building．

Find out a mistake in the following sentence and correct it（找出句中的错误，并改正）

They were seen A enter B the great hall on C the morning of D December 10.