玛丽当众讲话时总是很自信.
Mary is always confident when she speaks .
Finally, we managed to hand out all the 1,000 posters (凭借) other's help.
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)