Seven from ten leaves three.

　　10減7得3。

　　We started German in year seven.

　　我們在七年級開始學習德語。

　　There are three bars, with live entertainment seven nights a week.

　　有三個酒吧每周七個晚上都有現場文藝節目。

　　She anchored the evening news for seven years.

　　她主持了七年晚間新聞報道。

　　You're early! I wasn't expecting you till seven.

　　你來得真早！我還以為你七點鐘才到呢。