假设你是Peter，你的同学Mike经常在教室里随地丢纸片、塑料袋等；他还避开父母和老师抽烟。作为同学， 你将如何劝说他改掉不良的习惯？请你给他写一封信。
要求:1. 用上所有提示，可适当发挥； 2. 语言正确，行文流畅，书写规范；
3．词数：80左右。信的开头和结尾已给出；4．文中不能出现真实姓名及校名。
Dear Mike,
As your classmates and one of your best friends,
Yours,
Peter
Mrs. Black isn’t used to _________ by sea and she used to _________ sick a lot.
| A．traveling; feel | B．travel; feeling |
| C．travel; feel | D．traveling; feeling |
The old man lives _________ in the country, but he doesn’t feel _________ at all.
| A．alone; lonely | B．lonely; lonely |
| C．alone; alone | D．lonely; alone |
---Must I return the dictionary today?
---No, you _________. You _________ keep it until next week.
| A．mustn’t; can | B．don’t have to; can |
| C．needn’t; should | D．don’t have to; should |
I’m not good at Maths, so I don’t know _________ out this difficult Maths problem.
| A．when to work | B．who to work |
| C．what to work | D．how to work |
---Your sister _________ a lot during these years.
---Yes. She _________ three years ago.
| A．changed; got married |
| B．changed; has been married |
| C．has changed; got married |
| D．has changed; has been married |