Ⅰ.单词拼写
1．Seen from the moon, our earth, with water c________ seventy percent of its surface, appears as a blue ball.
答案：covering
2．He invented a new m________ of teaching English.
答案：method
3．After he handed in his homework, the teacher made several c________ in red ink.
答案：corrections
4．She was so e________ by his loud laughter that she wanted to leave at once.
答案：embarrassed
5．The young people between thirteen and nineteen are t________.
答案：teenagers
6．Our company is planning to introduce the fiveday week ________ (制度)．
答案：system
7．She received a ________ (文凭) from Harvard last year.
答案：diploma
