People already know a lot about animals. However, there are still some things about animals that may surprise you. Here are {#blank#}1{#/blank#}about animals you probably didn't know.

    Cows do have best friends and feel stressed when they are separated. Scientists have found that cows are very social animals and that a cow always {#blank#}2{#/blank#}other cows. When a cow is with its friends, it feels relaxed, compared with when it is alone.

    During a breeding season, a male penguin will offer a small stone to a female penguin as a gift. If she takes it, they will become partners. When the female penguin lays an egg, she and her partner may carry it {#blank#}3{#/blank#}, because some penguins don't build nests.

    Crocodiles (鳄鱼) swallow (吞) stones. Crocodiles always swallow their food instead of eating it like other animals. They swallow stones which break the food into very small pieces in their stomachs. These stones may stay in their stomachs {#blank#}4{#/blank#}.

    Elephants use plants to treat pain or other illnesses. Scientists once found a pregnant (怀孕的) elephant in Africa who ate a kind of plant which was not part of her normal food. Four days later, she {#blank#}5{#/blank#}a baby elephant. The same plant was used by the local pregnant women.

    With the1of the Internet, shopping is not a difficult thing. Just as your2chooses the article (物品) you like, the shopping is finished. You needn't walk out of the3. It seems easy and quick. But there4always a trap (陷阱) online. If you are careless, it will bring you some5. You may find the colour of the article is6from what you want, or the size is either too small7too big. If you want to be different, you'd better not buy clothes8. Once you put on the clothes you buy online and go out, you will find many9wear the same clothes in the street.

    So when you buy something online, you must be10.

I always tried to do something for the children in some poor villages. On a hot July day, I{#blank#}1{#/blank#} (参加)a group of volunteers and came to a small village in the west of China to  build a library at a primary school.

After a three-hour ride, we{#blank#}2{#/blank#}(到达) the village  at last. The school was poor and we had to choose a{#blank#}3{#/blank#} (明亮的) small room as the library. Our job was to{#blank#}4{#/blank#} (改变……的位置) the books into the room, place them on the{#blank#}5{#/blank#} (架子) and set up small tables and chairs.

I soon found the work wasn't as fun as I had{#blank#}6{#/blank#} (期盼). Later that afternoon, students began to borrow books from the library. One student thanked us again and again because they couldn't{#blank#}7{#/blank#} (买得起) so many books. My{#blank#}8{#/blank#}(心) was filled with Joy. Then we worked on and in the end, we {#blank#}9{#/blank#} (创造) a library.

It only took us one day to build the library, but it will make a{#blank#}10{#/blank#} (差别) to the children's lives.

My brother Tom is very kind. He is always ready to help people who are in{#blank#}1{#/blank#}(苦恼). Now he is studying in a university. At the same time, he is a volunteer at a local after-school p{#blank#}2{#/blank#}. It {#blank#}3{#/blank#}(提供) some service to those who are not good at their studies. 

Last year, he s{#blank#}4{#/blank#} up a special website for the disabled children. At first, he met many difficulties. However, he worked them out quickly. He also called up more helpers to join the program. They spent{#blank#}5{#/blank#}(数个) hours with the children every week and taught them how to take care of themselves. Many parents feel e{#blank#}6{#/blank#}because they can't imagine their children can study like normal children. 

"W{#blank#}7{#/blank#}Tom's website, the program would be unable to have enough helpers to help us. I get such a strong feeling of satisfaction (满意)" one of the program {#blank#}8{#/blank#}(主人) says. 

"I feel happy to teach those children how to study. The happiest thing is that I can also{#blank#}9{#/blank#}(发展) myself and it can make my dream come{#blank#}10{#/blank#}(实现)." Tom says.