单选题 The second paragraph is about ways to decide whether teaching should be one's future employment.

单选题 The first paragraph is mainly about how to plan lessons and prepare homework.

单选题 - Excuse me, could you show me the way to the nearest post office?
- ______Oh yes! Two blocks away from here at the Green Avenue. You can't miss it.

单选题 A teacher should show a firm mind that is able to control tiredness and unhappiness.

单选题 - I wonder if I could use your computer tonight?
- ___________ I'm not using it right now.

单选题 - Excuse me, could you tell me the time?
- _________

单选题 - Could I borrow your car for a few days?
- ________

单选题 - Unbelievable! I have failed the driving test again!
- _______ This is not the end of the world.