New Words：

corner [ˈkɔːrnər] n. 角；拐角；街角；墙角
serve [sɜːrv] v. 服务；提供；接待

Sample Sentences：

I hit my knee on the corner of the table.
Students come here from the four corners of the world.
Write your address in the top right-hand corner of the letter.

To serve the people is our duty.
Breakfast is served between 7 and 10 a.m.
This man would go through fire and water to serve his friend.

duty ['duti] n. 责任；职责；义务；值班
through [θruː] 穿过；通过

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