从下面的方框中选择一个适当词填空，并将其正确形式写在句中横线上，每空一词，只用一次。
beautiful lend smoke much kindness energy protect luck invent twenty-one
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小题1:This year is 2012. We are living in the __________Century.
小题2: ---“Honey, I need to refresh myself. Do you mind my ____ in the living room？
---No way!”
小题3:Computer is one of greatest _____，I can’t imagine what our life would be without it.
小题4:---Mr. Sun, could you give me some advice on how to improve my spoken English?
-----The____ practice you make, the better your spoken English will be.
小题5:It’s _____ of you to help the people in need.
小题6:A low-carbon lifestyle has an effect on our daily life. People should pay more attention to saving _____.
小题7:There was a big fire in the office yesterday. _______，all the people were saved.
小题8:Our goal is ______ our environment from being destroyed.
小题9:On April 14th, an earthquake hit Yushu and destroyed its _______completely.
—It’s a great pity.
小题10:Tomorrow Tom will return the book I _____ to him. .
