-Why did you talk to the teacher after class?-I didn’t understand______________ during the lecture.
32. ––When will you be back, Peter?––________a couple of days.
31. All books ______ to the library more than three days late will be subject to a fine.
30. When he was only thirty years old, he had already experienced______most people only experience when they are much older.
29. ______ in the sports world, a sportsman needs to train constantly to keep himself in best condition.
28. Listen, Mike. She_________have done it. She’s been with me at the shop all day.