问题描述：
1.The Yellow River is __the second longest_________river in China,
2,Susan is a __seventy-year-old___woman.
3.It is ten years since he went to New York for study.
4.I ___spent___at least two hours doing my homework yesterday evening.
6.She had to ask for _a three day leave___because of her illness
7.A new library with 50 thousand books will be opened.
8.My sister became a teacher 6 years ago
9.__40 percent__of the students in our school are from the country.
10.Tomorrow we are going to learn _Lesson Six_,
2,Susan is a __seventy-year-old___woman.
3.It is ten years since he went to New York for study.
4.I ___spent___at least two hours doing my homework yesterday evening.
6.She had to ask for _a three day leave___because of her illness
7.A new library with 50 thousand books will be opened.
8.My sister became a teacher 6 years ago
9.__40 percent__of the students in our school are from the country.
10.Tomorrow we are going to learn _Lesson Six_,
问题解答：
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