A good way to answer this question is:

To a certain extent I agree that... However, I also think that...

By saying that you agree to a certain extent (not completely), you can now talk about both sides of the argument.

Example question:
People visiting other countries should adapt to the customs and behaviours expected there. They should not expect the host country to welcome different customs and behaviours. To what extent do you agree or disagree?

My introduction:
To a certain extent I agree that visitors to other countries should respect the culture of the host country. However, I also think that host countries should accept visitors' cultural differences.

After this introduction, you can write one paragraph about each view.

博主注： 双边写法： To a certain extent I agree that visitors to other countries should respect the culture of the host country. However, I also think that host countries should accept visitors' cultural differences.

单边写法：It is true that different customs and behaviours between visitors and host countries will cause a varity of conflicts.However, to a large extent, I disagree with the idea that visitors should adapt to the culture and behaviour of the host country.

相比之下，双边写法比单边写法更有回旋的余地，想ideas也比较容易。