17．You should bepunctual （準時的） for the appointments．

分析 你應(yīng)該準時赴約．

解答 punctual考查形容詞．根據(jù)所給的漢語提示"準時的"和空前的系動詞be可知，此處應(yīng)用形容詞形式，故填punctual．

點評 形容詞是中學英語的重要語法，解題時首先要根據(jù)語境和邏輯來推斷出空所需要的詞性，或者是根據(jù)句子結(jié)構(gòu)的需要來推斷詞性，然后根據(jù)句意和所給的漢語提示選出正確答案．

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