New Words：

ahead [əˈhed] adv. 向前地;提前;领先;(时间、空间)向前面，在前面;

Sample Sentences：

Two boys were ahead of us.
I arrived at the theatre ahead of him.
We finished 15 minutes ahead of time.
You need to work hard to keep ahead.
Would you mind if I turn off the radio? -- Not at all. Just go ahead.

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