根據下面句子中的提示從下列詞組中選２個填入：

          a hard nut to crack
          a small fry
          a wet blanket
          a cold fish

1. A: Did you catch him, sergeant?
    B: No, this is just the _____________(無名小卒，小角色). The head of the gang is still at large out there somewhere. But don't worry, I'll get him sooner or later.

2. A: Who's the guy sitting down at the back, why doesn't he come up here and dance with us?
    B: That's John - he's a real _____________ (令人掃興的人). He'll probably sit there all night.

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