1.The Yellow River is

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1The Yellow River is second to the longest river in China.(second to :仅次于）
2Susan is a woman at the age of seventy.
3 He has gone to New York for study for ten years.
4 It took me at least two hours doing my homework yesterday evening.
6 She had to ask for a leave for three days because of her illness
7 A new library with 50 thousand books is to be opened .（be to do:打算……）
8 My sister has been a teacher for 6 years.
9Two fifths of the students in our school are from the country.( Two fifths ：五分之二,即40%）
10Tomorrow we are going to learn the sixth lesson.
======以下答案可供参考======
供参考答案1:
1.The Yellow River is __the second longest_________river in China,
[The second longest river in China is The Yellow River.]
2,Susan is a __seventy-year-old___woman.
[The woman known as Susan is seventy-year-old. (seventy years of age) ]
3.It is ten years since he went to New York for study.
[He went to New Yoek for his study ten years ago.]
4.I ___spent___at least two hours doing my homework yesterday evening.
[My homework took me two hours to plete yesterday evening.]
6.She had to ask for _a three day leave___because of her illness
[Her illness caused her to take a three-day leave.]
7.A new library with 50 thousand books will be opened.
[A new library which stores 50 thousand books is to be opened (soon).]
8.My sister became a teacher 6 years ago
[My sister has been teaching for the past 6 years.]
9.__40 percent__of the students in our school are from the country.
[Country students make up 40 per cent. of our school's population.]10.Tomorrow we are going to learn _Lesson Six[Lesson Six is what we are going to learn/cover tomorrow.]供参考答案2:1.黄河是中国第二长河。2.苏珊是一位70岁高龄的妇女。3.他去纽约求学已经七年了。4.昨天晚上我至少用了两个小时来写作业。6.因为生病她不得不请三天的假。7.一个拥有五万本图书的新图书馆就要开张放了。8.六年前我姐姐成为一名教师。9.我们学校有百分之四十的学生来自农村。10.明天我们讲学习第六课。