本集核心英语单词及例句：

1.blank (n.)填空处，空白表格
Put a word in each blank to complete the sentence.
每个空格填上一个单词，把句子补充完整。

2.mind (n.)大脑；头脑
You should always get enough rest so you can have a clear mind to do your work effectively.
你应该经常有足够的休息，这样你才能有个清晰的大脑让你有效的工作。

3.at a loss 不知所措
He was at a loss what to do in the face of difficulties.
遇到困难他便束手无策了。

4.empty (adj.)空的，空虚的
We returned the empty bottles to the shop.
我们把空瓶子还给了商店。

5.nothing (pron.)一无所有；什么也没有
There's nothing better than a good cup of hot coffee.
没有比喝一大杯热咖啡更惬意的事情了。

6.frequently (adv.)频繁地；时常
He journeyed frequently to Beijing and other places.
他常去北京和其他地方旅行。