谁帮忙帮我造几个句子啊?

1.They made up their mind to study hard.
他们下了定决心努力学习.
2.I spent two hours doing my homework.
我花了两个小时做我的作业.
3.Don't worry! Let me help you.
别着急!让我来帮助你.
4.I'd like to go with you.
我愿意和你一块去.
5.I'm not sure that he is right.
我不确定他是对的.