考试前一定要好好睡一觉。

Make sure to have a good sleep before the exam.

一定要好好清理伤口以避免感染。

Make sure to clean the wound properly to avoid getting infected.

所以，使用之前一定要好好清洗。

So, do give it a good wash before you use it.

一定要好好保存哦。

You must keep it carefully.

我想我们一定要好好解决这个问题。

I believe we have found a really neat solution to this problem.

在接下来的几天一定要好好的治疗。

It will be treated with specialised work over the next days.

他是省里派来的调研员，一定要好好招待。

He is an investigator sent by the provincial government. We must treat him well.

他是省里派来的调研员, 一定要好好招待.

He is an investigator sent by the provincial government . We must treat him well.

他是不可多得的梁木，你一定要好好重用他。

He is a person of rare talent. You must put him in a very important position.

我一定要好好的运用音标，来解决不会的单词。

I must learn well phonic tone in order to unerstand unknown words.