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1.guarantee n．保证(人/物)
2.available adj. 可利用的；可得到的
3.lack v. 缺乏；不足
4.advise vt. 建议
5.active adj. 忙碌的；活跃的
6.importance n. 重要(性)
7.function vi. 起作用
8.particularly adv.特别；尤其→particular adj.特殊的；挑剔的；讲究的
9.variety n．多样(性)→various adj.各种各样的→vary v．变化；改变
10.balance vt.使保持平衡 n．平衡→balanced adj.平衡的
11.contributevi.贡献；出力；捐献→contributionn．贡献；捐款→contributor n．捐献者
12.concentratevi./vt.专心于；注意→concentration n．集中注意力；专心
13.stress vt./n.强调；着重；压力；紧张→stressful adj.充满压力的；紧张的→stressed adj.焦虑的；紧张的
14.arrange vt./n.安排→arrangement n．安排
15.normal adj.正常的；正规的→normally adv.正常地；通常地
16.breathe vt./vi.呼吸→breath n．呼吸，气息→breathing n．呼吸 adj.呼吸的
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1.To keep healthy, you should keep a balanced (balance) diet.
2.The weather varies from day to day; as a result, people wear various clothes.A variety of germs spread in the air, and many people became ill.(vary)
3.After a stressful week of work, all the employees were extremely stressed and tired.They complained that few could work efficiently under stress.(stress)
4.The contributor contributed a large sum of money to the project; that is to say, his contribution to the project was great.(contribute)
5.We should concentrate our energy on the game for lack of concentration may cause us to lose the game.(concentrate)
6.In addition to these arrangements,_I will also arrange for my sister to pick you up at the airport tomorrow.(arrange)
7.I like exercising very early in summer.The morning air is so good to breathe and I often take a few deep breaths.(breath)
8.It’s normal for the disabled to live normally like our heathy people.(normal)
9.The boy is particularly interested in making model planes but he is not particular about what he eats.(particular)
10.Knowing the importance (important) of making the right choice, he has to select carefully.
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