1)Where was Peter yesterday? He … (be) at school. The school year started a week ago. 2)I’m absolutely sure! They … (arrive)

1) Where was Peter yesterday? He was at school. The school year started a week ago. 2) I’m absolutely sure! They have arrived yesterday. I saw their tickets. 3) The course began on the fifth of September but I’m not so certain about it. 4) Are you joking! Nick went to Moscow last week. He’s supposed to be at work now. 5) They have come from London, but I’m not sure. 6) We have taken the wrong turn. We should be there by now. 7) They have missed their train. Otherwise they would be here by now. 8) It was Masha who answered the phone because she’s away. 9) I can’t find my cat anywhere. She coudn\'t get out through the window. The opening is too small.