that引導什麼從句可以省

My teaching style is similar to that of most other teachers.

我的教學風格和多數教師相似。

Keep going like that ─ you're doing fine.

就這樣做下去——你做得蠻不錯嘛。

She's a changed woman since she got that job.

她自從得到了那份工作，變得判若兩人。

That must be her now.

這會兒一定是她了。

It's the fifth time that I've been to America.

這是我第五次去美國了。