New Words:

calm [kɑːm] 镇静的;沉着的;风平浪静的;无风的
promise [ˈprɒmɪs] 许诺;承诺;答应;保证
swam [swæm] swim的过去式
swum [swʌm] swim的过去分词

Sample Sentences：

We swam in the calm sea.
Please calm down! We'll find her.
I kept telling myself to keep calm.

Promise me you'll take care of yourself.
Promise me you will not waste your time.
I can promise you, you'll have a wonderful time.

take care of 照顾

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