Ⅰ.单词拼写
1．One of NASA's major concerns about astronauts (宇航员) is how they can remain healthy for long in space.
2．He is quite optimistic (乐观的) and insists on carrying out the plan, so you'd better not stand in his path.
3．With disciplined (遵守纪律的) work habits, you are likely to succeed as an online student.
4．If you are enthusiastic (热心的)about the subject you study, you are willing to do everything to make it a reality.
5．But it is far from being enough and the endangered pandas need cooperation (合作) from the rest of the world.
6．I had to be really persistent (坚持的) and it was very hard work.
