重点讲解：
1. run out of 用完；耗尽；
例句：We have run out of head notepaper.
我们已用完了有抬头的信纸。
2. clean up 打扫；清扫；把…弄干净；
例句：She is cleaning up the kitchen now.
她现在正在打扫厨房。
3. find out （尤指特意通过努力）发现，找出，查明；
例句：Don't just accept his say-so: find out for yourself.
别听他信口开河，你得自己去弄清楚。
4. make sure 一定要；设法保证；
例句：You must make sure of the time and place.
你必须把时间和地点弄清楚。
5. as well 也；还；
例句：I write my own songs and I play the guitar as well.
我唱自己谱曲的歌，也弹吉他。
