Don’t call him now. He .......................... lunch.

In which sentence is all PUNCTUATION correct?

Which one of the underlined words or phrases is INCORRECT? Kate forgot where she have put her keys when she was going to…

His parents worked very hard ....................... he could go to a good university.

I've been looking for Professor Brown. ........ 30 minutes. Do you know where he is?

I have never ..................................... run a full marathon.