根据中文提示写出单词或词组，使句意完整、正确。
—These          （德国人）are good at swimming.
— Yes, practices makes perfect.
—What do you think of your English teacher?
—Very good. He always _______(鼓励) us to learn from each other.
—What do you often do in your free time?
—We often play__________ ( / tʃes/) together.
— As we know, the plants are hard to live in a _____________(/drai/) place.
— So it is our duty to protect the environment.
—I am _______(短缺) money to buy a new bike.
—Oh, that’s too bad. You have to walk.