18．One of our rules is that every studentshall wear school uniform while at school．

分析 我們的校規(guī)之一是每個(gè)學(xué)生在校時(shí)都必須穿校服．

解答 答案：shall
解析：根據(jù)句意"我們的校規(guī)之一是每個(gè)學(xué)生在校時(shí)都必須穿校服"及所給英文提示可知，本題考查情態(tài)動詞shall的用法，shall在本題中用來表示"（某種規(guī)定或命令）必須"．

點(diǎn)評 本題考查單詞填空，做此類題目時(shí)一定要根據(jù)所給的中/英文提示及句意確定所填詞，再根據(jù)其他要求判斷所填詞的形式是否需要改變．

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