20 It started as a normal Monday morning. My alarm clock woke up early in the morning. (Глагол "wake" в прошедшем времени, прошедшее причастие "woken" не подходит по смыслу).
21 I had breakfast, brushed my teeth and RUN outside to catch the bus. (Глагол "run" в прошедшем времени).
22 At school I noticed that something was different. I came up to my friend Laura and asked her: "What's going on? Why BE everyone so excited?" (Используем "be" для описания состояния).
23 "Don't you know?" she said. "All the teachers LEAVE for a conference. Only the head teacher and a few of the school staff are here. (Глагол "leave" в настоящем времени, обозначает действие).
24 The senior students will be teaching us today. They are only two or three years OLD than us. How can they possibly teach us? (Прилагательное "old" используется для возраста).
25 However, she was wrong. Our substitute teacher, a student two grades above, was very serious. He said that he EXPLAIN some French poetry to us. (Глагол "explain" в прошедшем времени).
26 It was an unusual, but interesting French class. The poem WRITE on the board, our new teacher read it and then we discussed the poet's message, choice of words and other poetical things. (Глагол "write" в прошедшем времени).
27 Probably because the teacher was almost the same age as us, we felt relaxed and STORY about the poet and his spoke freely. He also told us several amusing time. When the class was almost over, our substitute teacher invited us to attend the next session of the school literary society. (Существительное "story" в прошедшем времени).
28 "I'm the Chairman of the society," he added, "If you come, we HAVE a special welcome party for new members." (Глагол "have" в настоящем времени).
Ответ: 20. up, 21. RUN, 22. BE, 23. LEAVE, 24. OLD, 25. EXPLAIN, 26. WRITE, 27. STORY, 28. HAVE