I am a bit puzzled as to why you have offered the alternatives "big surprise" and "strong denial". Are you imagining that these could mean the same, or are you trying to create sentences with different meanings?
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If this is an exam question, they want you to choose 'surprise' in the first one and 'denial' in the second one.
1. The news of her brother's accident cameinas a big surprise for her.
2. The team members were in strong denial of the wrong decision taken by their captain in the cricket match.
Sentence 1 should not have 'in'. I also prefer 'to her