1 must be 造句
you must be late if you dont hurry up a bit.
2 the most popular means of transportation 最流行的交通方式
3How faw is it from your office to bus station? 从你办公室到车站是多远？
4 spend _ in_____ doing homework spend___time____on homework
不懂继续问哈 这个很乐意帮你解答
共勉之！
1. He said that they must work hard. 他说他们必须努力工作。
4.spend time (in) doing 和 spend time on sth.
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