因为上海举行了2010世博会，所以数百万人前往了上海。(because，the 2010 Expo)
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那些吃均衡饮食的人应该比那些只吃甜食的人健康得多。（eat a balanced food, only）
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每天早上大声地朗读是英语获得成功的秘诀。(read aloud，the key)
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他过去学习不努力。当老师上课时，他假装在认真听讲。(used to，when)
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1.Amy used to be quiet，but now she is very o________．
2.My biggest p_______ is that I am too shy．
3.If you want to be healthy，it's n_______ for you to eat some vegetables and fruit．
4.You must pay a_______ to your mistakes．
5.He wanted to be a doctor，but he became a teacher i_______．
1. Jack _________ his father. They are both clever and a bit quiet.
2. She hasn’t seen her dog for three days. She is very __________ it.
3. I _________ have short hair but now I grow it long.
4. If you were more________ to people, you would have more friends.
5.You have to be 18 years old before you __________ drive.
