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The boy is too young to draw a __________ (笔直的) line on the paper.
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Professor White has written some short stories, but he is _____ for his plays.
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Halloween falls on October 31st. It is one of the most favourite holidays for children in the USA.
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找规律:第一行1;第二行2,4;第三行3,5,7;第四行6,8,10,12;第五行9,11,13,15,17;第六行14,16,18,20,22 aij=2009,则i+j=107
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