根据短文内容,填写所缺单词或用所给单词的正确形式填空。
In our busy daily life, we often forget the power of a simple smile. That's why Smile Day is so important. Smile Day is a special day celebrated every year on May 8. It is a day 1. (spread) joy and happiness among people from all walks of life. People around the world smile to each other warmly to show kindness and 2. (friend). Smiling can not only make 3. (we) feel happy from the bottom of our hearts but also make others feel welcome in a new place or a difficult situation. Even a small, sincere smile can make people feel warm and loved. On this day, we are encouraged 4. (smile) more, even to strangers, and share the positive energy with everyone around us. In some countries, people even organize all kinds of fun 5. (activity) to spread smiles, like giving free smile cards. Smiling is 6. universal language that connects people without any words. 7. we smile, we not only feel better but also make the world a better place to live in, which can bring people 8. (happy) and show that we care about each other. Let's try 9. (make)
every day a Smile Day! It's an easy way to bring joy to 10. (other) and light up our own life as well. Remember, a smile costs nothing but means everything. Let's keep smiling and make the world warmer.

1. to spread
2. friendship
3. us
4. to smile
5. activities
6. a
7. When/If
8. happiness
9. to make
10. others

1. 此处用动词不定式作后置定语，修饰名词day，说明这一天的作用，故填to spread。
2. 并列连词and前后词性要保持一致，前面的kindness是名词，此处需要将friend变为名词friendship（友谊），和kindness共同作show的宾语，故填friendship。
3. 动词make后要接人称代词的宾格形式作宾语，we的宾格是us，故填us。
4. 考查固定搭配be encouraged to do sth.，意为“被鼓励做某事”，故填to smile。
5. 固定搭配all kinds of后接可数名词复数形式，activity的复数是activities，故填activities。
6. 此处泛指“一种通用语言”，universal以辅音音素开头，要用不定冠词a，故填a。
7. 此处引导时间/条件状语从句，表达“当我们微笑时/如果我们微笑”的含义，符合语境，故填When（也可填If）。
8. 固定结构bring sb. sth. 意为“给某人带来某物”，此处需要用名词作宾语，happy的名词形式是happiness，故填happiness。
9. 考查固定搭配try to do sth.，意为“尽力做某事”，故填to make。
10. 此处指代“其他的人”，作介词to的宾语，others相当于other people，故填others。