Illegal aliens are people living in the U.S.A with proper__1__ authorization. Many entered the country by sneaking　across the border. Others came on temporary student or visitor visas and did not leave until their visas were expired.__2__ Most illegal aliens want to stay in the U.S.A. because employment opportunities are so much great than in their native country. Since illegal aliens try hard not to be discovered by the government, it is possible to get an __3__ accurate count of them. Recent estimates ranged from __4__ 2.5 million to as high as 12 million. In 1986, the United States government adopted a new law affected illegal aliens— __5__　　the Immigration Refrom and Control Act. This law was designed to accomplish two main goals:1） to allow illegal aliens who have been living in the country since __6__ January, 1982 to gain legal status if they applied by May 4,1988; and 2） to encourage others from coming into or __7__ staying in the country illegally by making difficult for__8__ undocumented people to find employment. The law prohibits American employers from hiring illegals and providing for severe penalties—fines and even imprisonment—__9__ if they do so. This new law has helped large number of__10__ formerly illegal aliens to become legal residents. But it also　forces employers to check on all prospective employees who look or sound foreign to be sure that they have documents allowing them to work. This may discourage some employers from hiring any immigrants.
    【答案】
    1. with—without.根據(jù)illegal aliens的定義，應(yīng)該是people living in the U.S.A without proper authorization
    2. until—when.從邏輯意義上來分析，是Others……did not leave when their visas were expired（當(dāng)簽證到期時他們也不離開美國）
    3. possible—impossible.從上下文的說明判斷，要弄清楚到底有多少非法居住在美國的外國人，或得一個確切的數(shù)據(jù)是完全不可能的
    4. ranged之前加have.因?yàn)槭侵竏id not leave until their visas were expired. Recent estimates而不是以往的estimates
    5. affected—affecting.此處相當(dāng)于（a new law）which/that affect illegal aliens
    6. have—had.用過去完成時，因?yàn)檎麄€句子討論的是過去的事，并且此處具體指country since January, 1982 to gain legal status if they applied by May 4,1988
    7. encourage—discourage.如果為encourage則與全文考試大的邏輯和意義矛盾
    8. 在difficult之前加it.making it difficult for undocumented people to find employment，其中it為形式賓語，實(shí)際賓語為不定式短語（for undocumented people）to find employment
    9. providing—provides.provides for severe penalties與prohibits American employers from hiring illegals 為并列謂語，而不是與hiring illegals并列
    10. number—numbers或在large之前加a.習(xí)慣為numbers of或a number of