Don’t forget where the emergency exits are _____an emergency.
| A．in place of | B．in favor of | C．in case of | D．in charge of |
31. All books ______ to the library more than three days late will be subject to a fine.
| A．return | B．returning | C．to return | D．Returned |
30. When he was only thirty years old, he had already experienced______most people only experience when they are much older.
| A．what | B．which | C．who | D．When |
29. ______ in the sports world, a sportsman needs to train constantly to keep himself in best condition.
| A．Survive | B．Surviving | C．To survive | D．Survived |
28. Listen, Mike. She_________have done it. She’s been with me at the shop all day.
| A．couldn’t | B．shouldn’t | C．needn’t | D．wouldn’t |
27. ––Do you want to go to the cinema tonight?
––Sorry, I’m so tired. I an early night.
| A．have | B．am having | C．have had | D．had |