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Choose the correct words

1. There's a man
   [lie|lying|to lie] in the middle of the road.
2. He is unconscious now. He
   [can|must|will] have fainted.
3. There
   [are|have|is] a guy next to him.
4. He
   [try|are trying|is trying] to save his life.
5. I think he
   [can|have to|could] be a doctor because it looks
   [as|like|– ] he knows how to do first aid.