The teens took a photo of smiling faces to welcome World Smile Day in . (五月)
Do you know what the exact (人口) of China is?
﹣How much time do you need to carry on with the project?
﹣Another (四)days.
一个人读书越多就会变得越聪明.
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一星期前,我想同学借了一本书. (borrow…from)
我过去常常害羞. (used to )