New Words：

steel [stiːl] 钢
tap [tæp] v.轻敲;轻拍;轻叩 n.水龙头
tapped [tæpt] tap的过去分词和过去式
tap water 自来水

Grace tapped on the bedroom door and went in.
格雷丝轻轻敲了敲卧室的门，走了进去。

He never drinks tap water.
他从不喝自来水。

She turned on the taps.
她打开了那些龙头。

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