Imagine that you’re approaching a coffee shop. Suddenly, your eyes are drawn toward an interaction between two _______ happening outside its doors. One man sits, leaning against the glass window, with a plastic bag of belongings on the sidewalk. A woman, with her hand tenderly outstretched, _______ him some bills. As you walk past the _______ and enter the coffee shop, do you _______ pulling out few bills and giving them to the man?

If you answered yes, you’re probably _______ what social scientists from UCLA’s Bedari Kindness Institute call “elevation” — an uplifting emotion often accompanied by a(n) _______ feeling in the chest, sometimes even by tears. _______, that feeling comes with some contagious (有感染力的) kindness. Researchers from the institute have studied _______ kindness can be contagious.

What they found, in short is yes.

In the study, half of the participants watched a video titled “Unsung Hero”, which follows a young man as he _______ his daily routine often ________ to help others. The other half watched another video of a man performing impressive parkour stunts (跑酷特技). These participants ________ five $1 bills as payment for their time. Then researchers invited them to make ________ to charity. Compared with the parkour ________ , people who watched the “Unsung Hero” video gave 25% more to charity.

________ by the insights obtained from the study, researchers at the institute teamed up with YouTube Kids to plan a series of videos to encourage K-12 kids to show others ________ as a way to remove bullying.

Ask people to name the world's tallest peak and anybody with general knowledge will say Mount Qomolangma. But quiz them on its exact_________and many will be not sure.

In 1975, Chinese surveyors_________that Mount Qomolangma was 8848.13 meters high. As_________improved, satellites, photoelectricity, radar and gravity measurement technologies were_________to get more exact figures. Of course, someone still had to carry_________to what is the world's rooftop.

In 2005, a Chinese team scaled Qomolangma and found that it was not as high as that, as they_________the height to be 8844.43 meters. Scaling Qomolangma is no_________task. The average air temperature there is - 29 degrees Celsius, even four degrees_________than in Antarctica. The snow there is 4 — 5 meters thick and hurricane-like_________blow all the time. Team members had trained to__________the extreme conditions.

In a nutshell, measuring Qomolangma's height is a tall order,__________a large number of financial and human resources. But it is worth the__________Mount Qomolangma is the perfect__________into crustal (地壳的) movements. And changes of the peak's height could__________whether the two plates are heading toward or away from each other.

Besides, the condition of snow and other natural materials at the top could be an indicator of upcoming climate change on the Tibet-Qinghai Plateau. That's why measuring Qomolangma's height is so__________.Put to good use, it can benefit mankind.