—Where is my dictionary? I remember I put it here yesterday. —You ______ it in the wrong place.

 “Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”

I ___, but I didn't think you were serious.

He warned me of what I otherwise __________ about the accident.

It's high time that you ________ even harder at your lessons as the exam is around the corner.