knee/kneel/lap/knife/knock/know/knowledge/acknowledge/acquaintance/ignore/ignorant
记忆：
1. knee [ ni: ] n. 膝, 膝盖 A man shouldn’t get down on his knees easily.男儿膝下有黄金（男人不能轻易下跪）
2. kneel [ ni:l ] vi. 跪下 Rather than kneel down, we prefer to be killed.我们宁死不屈。
3. lap [ lAp ] n. (坐时的)大腿前部, 膝盖, (跑道的)一圈 My left lap was hurt seriously when I fell down. 我摔跤时左腿伤得很厉害。
4. knife [ naif ] n. 刀 Here is a knife to sharpen your pencil, my dear boy.孩子，这儿有把小刀可以削你的铅笔。
5. knock [ nCk ] v. 敲, 敲打, 敲击, (使)碰撞 You should knock at the door instead of knock the door. 你应该敲门而不是撞门。 knock at the door 敲门 knock in (把钉子)钉入 knock into n.撞上
6. know [ nEu] v. 知道, 了解 How much do you know about him? 你对他了解多少？ know sth 知道某事 know sth/ sb well 对……很熟悉 know that know wh- clause know wh- to do 知道怎么做 know of sth/sb 了解 know sb to be be known to sb 某人知道
7． knowledge [ 5nClidV ] n. 知识 （不可数名词）但：a knowledge of 对……的一些了解 Knowledge can change our life.知识改变命运。 格言：A little knowledge is a dangerous thing.浅学误人。
8． acknowledge [ Ek5nClidV ] v. 承认 Facing the witness, he had to acknowledge his crime. 面对证人，他不得不承认他的罪行。
9，acquaintance [ E5kweintEns ] n. 相识, 熟人 Acquaintance can make it easier to stay in another place. 在他乡有熟人办事容易些。
10． ignore [ i^5nC: ] vt. 不理睬, 忽视 Ignoring our shortcomings is not the right attitude.忽视我们的缺点不是正确的态度。
11． ignorant [ 5i^nErEnt ] adj. 无知的 I should say he is ignorant of our cultural tradition. 我要说他对我们的文化传统的无知的。
另类阅读：
The poor boy had little knowledge of manners. He didn’t knock at the door before he came in. The man in the room took up a knife and ordered him to get down on his knees. The boy knelt a long time and felt his knees hurting a lot.
轻松一刻
A guard was about to signal his train to start when he saw an attractive girl standing on the platform by an open door, talking to another pretty girl inside the carriage.
"Come on, miss!" he shouted. "Shut the door, please!"
"Oh, I just want to kiss my sister goodbye," she called back.
"You just shut that door, please," called the guard, "and I'll see to the rest."