很难知道如何处理（这）类案例。

It's difficult to know how to treat ___such cases.

我试着用一种不会让她难过的方式告诉她。

I tried to tell her in ___such a way that she wouldn't be upset.

我们可以利用这类活动来吸引新成员。

We can use ___such events to attract new members.