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(每一行只有一个错误)，则按下列情况改正。

该行多一个词；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。

该行缺一个词；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。

该行错一个词；在错的词下画一横线，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。

A group of scientists were planning to go

to countryside to do a scientific research in order to　　　　　　　　 86．____

find out that whether the environment of the country　　　　　　　　 87．____

had polluted. On arrival , they started to check the　　　　　　　　　 88．____

air and water. To our surprise, they found　　　　　　　　　　　　 89．____

how terribly the situation was. They could see　　　　　　　　　　 90．____

the serious pollution. Look into the cause,　　　　　　　　　　　　 91．____

they persuade the government to pass the law　　　　　　　　　　 92．____

to protect environment and kept the balance of　　　　　　　　　　 93．____

nature. Now everything has changed. Birds are　　　　　　　　　　 94．____

singing while tree and grass are waving.　　　　　　　　　　　　 95．____

85．Last year Sam went to____ (欧洲) on business. 　　　　　 85．____

84．I'll have to buy a pair of____ (裤子) to match my new shirt.　　 84．____

83．He____ (答应) me that he would pay back within a week. 　　 83．____

82．The____ (攀登) made me worn out when I reached the top of the mountain. 82．____

81．Tommy was____(缺席) from school with a cold.　　　　　 81．____

80．Geographically the United States may be s____ into three major districts. 80．____

79．Plastic is a kind of widely used m____.　　　　　　　　　 79．____

78．G____ speaking, the more expensive the TV is, the better it is.　 78．____

77．This v____ painting is worth more than a million.　　　　　 77．____