New Words：

clock [klɒk] 时钟;钟
o'clock [əˈklɒk] (表示整点)…点钟

Sample Sentences：

This clock doesn't go.
That clock is ten minutes fast.
The clock said four minutes past eleven.

I go to work at 8 o'clock.
The clock said three o'clock.
I have a history class at 9 o'clock.

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