Correct each sentence 1) it is hot, but it has been cold two days ago. 2) the first world war has begun in 1914. 3) hurry up! the lesson just began! 4) does he wear a raincoat now? 5) do you go to the museum tomorrow? 6) i have opened the door and looked out. there was no one there. 7) he's met you, isn't he? 8) he's having breakfast, hasn't he? 9) what he cooked?
