请教几题英文习题.英文厉害的来帮下忙啊~!

请教几题英文习题.英文厉害的来帮下忙啊~!
Task4 Rewrite the following sentences after the models
Model 1: In the past ,bearing children was the top task of a family
—Bearing children used to be the top task of a family.
1.I often stayed up late when I was a student
?
2.Mr.Johnson traveled a lot when he was single.
?
Mode 2: The male managers are all married with .The female managers are both divorced and chidless
—The male managers are all married with .while The female managers are both divorced and chidless.
1.Thir country has plerty of oil . Ours has none
2.They want a house .We prefer to live in an apartment
Mode3: If they are asked this question now. most scientists will probably give you the answer “No”.
—If asked this qusiton now, most scientists will probably give you the answer “No”.
1.When she is in trouble, Mary always turns to her parents for help.

Mode4: we must make the world safe .The our children’s lives are secured(so that)
—we must make the world safes so that our children’s lives are secured
1. I did not realize the importance of the meeting .He told me about it(unil)
一起6题帮下忙哦~！补充下
例题1 used to be 是有下划线的
2.while 是有下划线的
3.If asked this qusiton now,是有下划线的
4.we must make the world safes so that our children’s lives are secured 是有下划线的
如果能说出题目要求做什么 中文意思等等最好 麻烦了

when I was a student I often stayed up late
when Mr.Johnson was single he traveled a lot
Thir country has plerty of oil ,but Ours has none
They want a house ,but We prefer to live in an apartment
When in trouble,Mary always turns to her parents for help
I did not realize the importance of the meeting unitl he told me about it