Ken is my friend. He {#blank#}1{#/blank#} (come) from London, UK. Five years ago I {#blank#}2{#/blank#}(meet) him at Lily's party. Then we {#blank#}3{#/blank#} (become) good friends. Ken and I {#blank#}4{#/blank#} (reach) Washington D.C. at the same time. We{#blank#}5{#/blank#} (start) to study medicine in the same school. Now we are still studying together. So I know more about him. Ken is funny He often {#blank#}6{#/blank#} (make) up some interesting stories to make me laugh. He says he's not going to be a doctor when he graduates (毕业). He {#blank#}7{#/blank#} (want) to be an actor. He {#blank#}8{#/blank#} (take) acting lessons when he is free. He {#blank#}9{#/blank#} (make) lots of funny movies to make people happy. I believe his dream {#blank#}10{#/blank#} (come) true.

    People have always been interested in animal communication and scientists have done a lot of research {#blank#}1{#/blank#} this subject. Most animals communicate by smell. Dogs are famous for this. When a dog walks outside, it learns about other dogs by {#blank#}2{#/blank#} (smell) things. Dogs {#blank#}3{#/blank#} (help) the police since a long time ago. Everyone has heard birds singing. Research has shown that many other animals use sounds {#blank#}4{#/blank#} (communicate). Frogs and insects communicate with sounds. Usually the "men" make sounds to invite the "{#blank#}5{#/blank#} (woman)". Whales and elephants {#blank#}6{#/blank#} use sounds to communicate. These sounds can travel very far through water or the ground. However, it is {#blank#}7{#/blank#} (possible) for humans to hear some of the sounds. They are {#blank#}8{#/blank#} too low or too high for us. Animals have always used body language to communicate as well. {#blank#}9{#/blank#} a dog puts its tail under its body, it is scared. When a dog wags its tail and {#blank#}10{#/blank#} (open) its mouth, it is happy.

—Not yet. I {#blank#}1{#/blank#} (watch) it this Sunday.