题目
1．An increase in the price of drugs has c________ to the rising cost of medical care. 2．Scientists are trying to find new fuel to r________ oil as its price is higher and higher. 3．Some people think English is difficult to learn.The reason is that there are so many c________ rules. 4．Canada has two o________ languages：English and French. 5．He is so clever a boy that he has learned over 1,000 Chinese c________ at the age of seven.
答案：1.contributed 2.replace 3.confusing 4.official 5.characters
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