一. 根据汉语、解释或首字母提示完成句中所缺单词(20分)

　　1. Dropping ____________(垃圾)everywhere is not good for our environment.

　　2. Never leave the tap ____________(流动)after you wash your hands.

　　3. Whose _____________(顺序) is it to cook tonight, your brother or your sister?

　　4. We are going to the farm to ____________ (摘)apples.

　　5. He stood up ___________(礼貌地) when the lady came into the room.

　　6. Mr. Smith _________(问候) all the guests warmly as they arrived.

　　7. It didn’t move, so she ____________(推) harder.

　　8. Barry never lets anyone _________(触摸、碰) her piano.

　　9. We tried to ___________(避免) the car accident but we failed.

　　10. Did you have any ____________(亲密的) friends at school?

　　11. Mr. Wu spent a lot of time ___________(解释)the maths problem to us.

　　12. Can you keep your voice down in __________(公共的) places?

　　13. The police _________(警告) the man of danger jogging alone before he went into the mountain.

　　14. ___________(停车) is always very expensive in the city centre.

　　15. –Safety comes first. Remember to ________ yourself away from danger. --We will, father.

　　16. My mother was greeting ____________(宾客) at the gate when I got home.

　　17. What’s your __________(目的)for holding this party?

　　18. Some people think it is ______________(不礼貌的) to ask someone’s age.

　　19. The article is good in __________(内容), but there are too many mistakes.

　　20. We haven’t reached the final ___________(总结) on this matter so far.