What do you think of zoology? —- In my opinion, zoology is ______ botany.

“Did you have any difficulty in yesterday’s homework?”—“No, in fact I found _____.”

Peter tried on three jackets, but _______ of them fitted him.

Again and again the doctor_______ the crying baby girl, but he couldn’t find out what was wrong with her.

Do you think yesterday’s math problem was difficult? —Yes. I could ________ work it out.