19．Tom is always carefulabout making comments on his classmates to avoid hurting their feelings．

分析 評價同學時Tom總是很當心，避免傷了感情．

解答 答案是careful．考查詞組be careful about 注意，當心．句意是"評價同學時Tom總是很當心，避免傷了感情．"故答案是careful．

點評 本題考查首字母填空．首先要判斷填寫的單詞及固定搭配，然后根據(jù)句意和相關語法填寫正確的答案．

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