Ⅱ. 单项填空(共15小题; 每小题1分，满分15分)
21. In order to save money, the poor girl gets up at______ dawn every day and walks to the factory in _______ distance.
A. the; / B. a; a C. /; the D. a; the
【解析】选C。考查冠词。at dawn“黎明”；in the distance“在远处；远处的”。
22. The pilot asked all the passengers on board to remain______ as the plane was making a landing.
A. seat B. seated
C. seating D. to be seating
【解析】选B。remain是系动词，后跟名词或形容词做表语，而seat在表示“坐着的”讲时，用seated。
