in turn 意思是：依次地，相应地，反过来
in return 意思是：作为报答，回报，后面接宾语得加介词for
例句：
- We will discuss each of these items in turn.
我们将依次讨论上述各项目。
2. The change of the climate makes the earth warmer, In turn,the warmth of the earth changes the climate ,too.
气候的变化使地球变暖，反过来，地球的变暖也改变着气候。
- The woman gave us food but asked for nothing in return.
那个女士给我们食物却不求任何回报。
4. Mr. Smith helped her.In return, she bought some drink for him.
史密斯先生帮了她。作为回报，她给他买了些饮料。
5. What can I do in return for your help?我能做什么来回报你的帮助
活学活用：
1. I‘d like to do something for you ___________ everything you've done for me.
2. A clean envrionment can help the city bid for the Olympics, which ________ will promote
its economic development.
3. I will go to help him with his work ________ his kindness.
4. The teacher called out the students' names_______.
参考答案：1. in return for 2. in turn 3. inreturn for 4. in turn