Scientists know that there were wolves on Earth about one million years ago. Dogs, on the other hand, have not been on Earth nearly as long. The oldest dog remains, found in Germany, are about 14,000 years old. Scientists have proven that dogs are descended from wolves. Though wolves and dogs share some of the same genes, they are not exactly alike. In fact, there are as many differences as there are similarities between the two.
First, there are physical differences between the two. Wolves have longer legs, larger feet, and a broader skull than dogs. They also walk differently from dogs. A wolf runs on its toes with its heels raised up from the ground. This is more similar to a cat’s walk than a dogs.
Second, there are mental differences between the two. Dogs have been domesticated. This means that dogs have been brought under the control of humans in order to provide companionship. Wolves have not been domesticated. They are wild animals. Having a dog as a pet is like having a juvenile wolf. A young wolf will turn into a mature adult, while a young dog does not mature. A dog might seem smart by performing tricks for people. Wolves need to be smart to survive in the wild. While it may not be impossible to have a wolf as a pet, scientists are of the opinion that a wolf could never be domesticated in the same way as a dog.
It’s important to keep in mind that the differences between the two are great, and each should be appreciated in its own habitat or home.

English is (30) first language of many people in countries outside the United Kingdom. When you meet speakers of English from around the world, you immediately notice that they do not all speak in the same way. There are also some (31) in the words they use, including the names of common objects that are part of everyone’s daily life. Although pronunciation and vocabulary are not the same everywhere, it is interesting that English speakers from opposite sides of the world can understand each other quite easily. It does not seem to care where they learnt the language. And of course, this is one reason (32) speakers of other languages are keen on learning English too. If you (33) English, you are more likely to be able (34) or work in all sorts of exciting places, such as the United States or Australia.