Ⅰ.单词拼写
1．To ________ (促进) cooperative learning, the school advises students to work in groups and assigns a tutor to each group.
2．People who a________ their power will be punished sooner or later.
3．Considering these n________ effects low gravity has on the human body, astronauts ________ (严格要求) themselves to do at least two hours of exercise every day.
4．When we come to a new environment, we have to make our ________ (心理) adapt to it.
5．We should form the habit of backing our files up in case we d________ them by mistake.
