1、Although the talk had already been on for five minutes,he

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1、Although the talk had already been on for five minutes,he still was not able to find a chair ____.
A.to sit B.to sit down C.to sit in D.for sitting
这题我知道不选A和D的原因,但是B和C怎么选,
2、When the bell rang for the class,the students stopped ____ to wait for their teacher _____.
A.to talk,to come B.talking,to come C.not to talk,coming D.talking,coming
这题我知道第一个空选talking,为啥

第一题：
答案：C
1、后面用动词不定式结构作后置定语,修饰前面的chair.排除D答案.
2、sit 是不及物动词,表示“坐”,后面不能直接接宾语,而这里sit的逻辑宾语是前面的chair,所以排除AB答案,down 为副词.
第二题：
答案：B
stop doing sth 表示“特指做某事”,根据句意,我们先排除AC答案.再者,wait for sb.to do sth.表示“等待某人做某事”,后面用动词不定式结构.

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