1,中国登山队了.....重重困难,.....了珠穆朗玛峰。
A,顽强B,征服C,克服D,坚强
[C]
Here u need a verb. (B&C are verbs. A&D are adj.)
B is used on a certain person/sth. eg:他征服了她。/拿破仑征服了法国。
2,他是个的 孩子
A,顽强B,坚强C,坚定D,坚信
I think A&B are all right, but B is better.
Here u need a adj. (D is a verb. eg: 我 坚信 你是对的:I believe u r right.)
C is always used to describe sth., not sb. eg:坚定的信念.