I lost my key and couldn't get into the house.（我丢了钥匙，进不了屋子。）

This key unlocks the front door of the office.（这把钥匙能打开办公室的前门。）

The key to success is hard work and perseverance.（成功的关键在于努力工作和坚持不懈。）

She inserted the key into the lock and turned it.（她把钥匙插入锁里并转动它。）

You need to find the right key to solve this problem.（你需要找到解决这个问题的正确方法。）

The keychain has a cute little charm on it.（钥匙链上有一个可爱的小挂件。）

Please keep the key safe; we don't want to lose it again.（请保管好钥匙，我们可不想再弄丢了。）

He jiggled the key in the lock, but it wouldn't turn.（他在锁里晃动钥匙，但它转不动。）

The map shows the key locations of the city's attractions.（地图标注了这座城市景点的关键位置。）

Learning grammar is one of the keys to mastering a language.（学习语法是掌握一门语言的关键之一。）

The teacher gave us the key answers to the exercise.（老师给了我们练习的答案。）

I can't find my car key anywhere. Have you seen it?（我到处都找不到我的车钥匙。

你见过吗？） The key ingredient in this dish is fresh tomatoes.（这道菜的关键食材是新鲜的西红柿。）

Press the key on the keyboard to start the program.（按下键盘上的键启动程序。）

They used a master key to open all the doors in the building.（他们用一把万能钥匙打开了大楼里所有的门。）

The key to a healthy lifestyle is a balanced diet and regular exercise.（健康生活方式的关键是均衡饮食和定期锻炼。）

She always keeps her keys in a small purse.（她总是把钥匙放在一个小钱包里。）

The locksmith made a new key for me in no time.（锁匠很快就给我配了一把新钥匙。）

Understanding the customer's needs is the key to good service.（了解客户需求是提供优质服务的关键。）

The keyhole was too small for the key I had.（这个锁孔对于我拿的这把钥匙来说太小了。

）