Цель: Понять
Из текста можно понять, что речь идет о процессе приручения волков и дрессировки собак людьми. Давай разберем текст и заполним пропуски с соответствующими словами:
Many experts think that around 20,000 years ago, wolves and humans started to live side by side. Over time, some wild animals became tamed. For example, wolves chased away dangerous animals. They ate food that humans THREW away. Dogs BECAME humans' friends by accident. One of the reasons is that dogs are CLEVER. They can LEARN than other animals. Most dogs learn new behavior in just four tries. If you have a dog, think of a new trick and try to teach it to do it. Keep the instruction enjoyable for the best results. When your dog DOES a command, offer a small treat or say "Good dog!"
Итак, готово! Теперь текст заполнен нужными словами, и его можно прочитать как цельное предложение.