空气污染是现代社会最大的问题之一。
Air ____ is one of the greatest ____ in the modern world.

在英国，我们说找人分担一个问题，问题就变成了一半。
In English, we say that sharing a ____ is like cutting it in half.

——天气真好啊!为什么不去野餐呢？
——听起来很酷。走，野餐去。
—What a fine day! Why not go out for a ____?
—Sounds cool. Let’s go.

多么令人悲伤的消息啊！数以千计的人在尼泊尔地震中丧生。
What sad n____! Thousands of people lost their lives in the earthquake in Nepal.

I still remember the first time I left home for one or two ____(night).

正式场合不用名字称呼别人。常用头衔（医生、教授、主席）来称呼别人，除非别人不让用头衔来称呼他。
In formal situations, don’t use first ____. Always use titles (Doctor, Professor, Chairperson) until the person tells you not to.

——麦克收到他妈妈的来信了吗？
——收到了，今天早上他亲自签收的。
—Has Mike received his mother’s m____?
—Yes, he signed for it in person this morning.

热带雨林也有助于控制天气。当树木被砍掉的时候，天气变得更暖和了。另外，人类四分之一的药物来源于植物。这些植物有很多只有在热带雨林里能找到。
Rainforests also help to control the weather. When trees are cut down, it gets hotter. Besides, one quarter of our ____ come from plants. Many of these plants can be found only in rainforests.

很多科学家相信颜色能影响我们的情绪。
Many scientists believe that color can influence our m____.

托尼更喜欢他能跟着一起唱的音乐。
Tony prefers ____ that he can sing along with.