_____ number of the students in our class is 54.
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He has already worked for ____ hour.
A. an
B. a
C. the
Mike enjoys watching TV, while Jack is interested in listen to ____music.
A. the
B. /
C. a
前厅部的首要接待业务是( )。
A. 预订接待
B. 入住接待
C. 日常接待
D. 客账业务
菜单内容要保证供应,缺菜率不能高于( )。
A. 1%
B. 2%
C. 5%
D. 10%