Your pronunciation and intonation should allow the TOEFL raters to easily follow what you're saying.

你的语音语调应该能让 托福评委轻松地理解你说的内容。

Your pronunciation and intonation should allow the TOEFL raters to easily understand everything that you say.

你的语音语调应该能让托福评委轻松地理解你说的所有内容。

What you do is basically listen to some audio of a native speaker talking and you just mimic their pronunciation and intonation.

你所做的基本上就是听一些母语人士的讲话音频，然后模仿他们的发音和语调。

As part of the homework, I have already done a lot of reading and seem to have no problem with pronunciation and intonation.

作为作业的一部分，我已经做了许多阅读练习，我想我的发音和音调已经没有问题了。

There's a load of free staff, there's a lot more blog posts on all sorts of aspects of British English pronunciation and intonation.

那里有很多免费的东西，很多关于英式英语语音和语调的各种方面的博客文章。