1.in return 2.There is no doubt that 3.at war 4.think higly of
1.in return,We should help them in return.我们应该帮助他们以为回报。 2.There is no doubt that,There is no doubt that he at there.他肯定在那儿，这是毫无疑问的。 3.at war,The two sisters are constantly at war with each other.这两姐妹不时发生争执。 4.think highly of ,I think highly of your opinion.我对你的观点评价很高。
She helped me with my homework in return for that I had helped her before.
There is no doubt that the earth is goinig around the sun.
That two area are at war because of religion problem.
The boss thought highly of my work.