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(1) in order that it doesn't make the river polluted (2) in order to pass the entrance exam/in order that we can pass the entrance exam (2) in order that与in order to do sth.的关系 当主从复合句中的前后主语一致时，我们才可以使用in order to do sth.句式，如题(2)；否则必须使用主从复合句，如题(1)。 辨析 in order to do sth./ so as to do sth. /to do sth. / so…as to in order to do sth. 既可位于句首，也可位于句中； so as to do sth.不能放在句首； to do sth.不用于否定概念。 In order to / To keep up with his classmates, he studies hard. He studies hard in order not to / so as not to fall behind. so…as to只表示结果，表示“到某种程度以至于……”，否定形式为so…as not to。so后面接形容词或副词。 运用以上短语完成下面的情景 After a day's hardworking, we went to bed early. We were (1) __________ tired (2) __________ fall asleep as soon as our heads touch the pillows. (3) __________ finish the construction in time, we made up our minds to work 12 hours a day, which is (4) __________ a tough job (5) __________ we felt it hard to hold on. Our boss employed another 2 workers yesterday, (6) __________ we could have a better rest. (1)so | 
