I was lucky to have a happy childhood, one that most people would want to have. My family lived in a tiny     1     in Scotland. Our neighbors next door had a son named Danny, and we grew up together.

We     2     long summer evenings in the forests, digging up worms for fishing, and collecting feathers left by the birds. It was here that I discovered that I was allergic (过敏) to the tiny flies which     3     me and made my face swell (肿). There were a few walnut trees above the village and we would frighten the squirrels away and wait for them to ripen (成熟). However, the village was too far north for a proper     4    .

Danny was a     5     boy, and we made things out of branches, which we tried to sell in the village shop. We even     6     a tree house. Once I lost my footing, fell out and     7     my foot, so Danny washed my wounds in the river. He was a very     8     boy for someone so young. My mother     9     blamed me for tearing my clothes.   

It was the finest     10     anyone could have, and I’m proud of calling him my friend.

Zhang Hanliang, a martial arts teacher at Tianshui Normal University in Gansu province, has produced many traditional Chinese martial arts videos in the past years,     1     sixteen million viewers at home and abroad on the online     2     Bilibili.

Zhang, now 35 years old, has been     3     martial arts since she was seven. Thanks to her hard work, Zhang won her first sword (剑) championship in Gansu province at 13. She then got sword and spear titles at a     4     level when she was 17, and at 20, she won a series of championship titles in various categories. In 2007, Zhang began to work as a martial arts teacher at Tianshui Normal University, getting new     5     such as first-class national athlete and first-class national judge of martial arts.

In addition to her daily teaching tasks, Zhang has been     6     to France, Russia, Malaysia and other countries many times to teach martial arts. “Martial arts can be a bridge for     7     exchanges between China and other countries,” said Zhang, adding that she wanted to     8     martial arts to the audience through the     9    . And she hoped more and more foreigners could     10     and love martial arts.

Octopuses are masters on disguise (伪装). They can change their appearance in less than a second.

How do they do this? An octopus can disguise itself in three ways. One is by using     1    . An octopus's skin has special     2     called chromatophores. These cells are filled with yellow, brown, and red pigment (色素). When an octopus moves its muscles in a certain way, the cells produce colorful spots on its skin. Chromatophores can also     3     light. In blue light, for example, an octopus's skin will look blue. An octopus can also change its skin texture (皮肤结构). When the octopus moves its muscles, its skin can     4     unsmooth. It might then look like a plant, or coral. And     5     way an octopus disguises itself is by changing its     6    . Some, for example, roll their bodies into balls so they look like rocks. One type of octopus can change its form to look like other sea creatures — especially     7     ones, such as sea snakes.

Why are octopuses so good at disguising themselves? They have to be. The ocean is not a safe place for them. Because they have no     8     in their bodies, octopuses are like large pieces of meat. Many predators (捕食者) want to eat them — and they can eat them whole. To survive, octopuses have developed the     9     ability to change their appearance very quickly in order to     10     from predators.