为什么前面用to learn 而后面用learning呢?

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• The football fans cheered their team _____ the entrance _____ the field.A. at; on B. in; at C. at; to D. on; at这题答案选择C,我知道前面是固定团搭配,在入口处.可是后面为什么用to?
• I went to the cinema __I me an old friend today A:that B:which C:where我选的是A和B 后面的定语从句来修饰前面的电影院,修饰东西不是用that 和where么 但是书上的答案是C:where 为什么 求解?
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