I. 单项选择（20分）
1. I often go to school _______ foot, but I had to take _______ taxi to school yesterday because of rain.
A. by; / B. on; a
C. on; / D. with; a
【解析】选B。on foot“步行”, 是固定短语，不加冠词。take a taxi“乘出租车”。
2. —How was your weekend?
—It was wonderful. I had _______ fun.
A. many B. a lots of
C. a plenty of D. plenty of
【解析】选D。fun为不可数名词，用plenty of来修饰。ny 修饰可数名词复数，lots of=a lot of, 可修饰可数名词和不可数名词。
