If you want to plant a tree, you should first          (挖) a hole.
History books can improve our        (知识) of the past.
Many people like to        (预定) tickets and hotels online.
In Switzerland, people are not          (允许) to cut down trees.
Some children are too shy to join the          (讨论).
If we don’t take action to improve the environment, more        ['lɪvɪŋ] things will be killed by pollution.
Don’t park your car in a public place, or you will be          (罚款) by the police.
J. K. Rowling’s books are loved by young        (读者) all over the world.