问题补充：
Tony used to to school, but he is used to to school now.
A. walk; taking a bus
B. walked; took a bus
C. walk; take a bus
D. walked; taking a bus
答案：
(答案→)A. walk; taking a bus
B. walked; took a bus
C. walk; take a bus
D. walked; taking a bus
解析：句意：Tony过去总走路去学校，但他现在习惯坐公交车上学。Used to do过去常常做某事，be used to doing sth适应做某事；故选A。
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