I know nothing about American history. So when I ______ about it, I couldn’t answer it at all.

Do you often _____ information for your lesson on the Internet -Yes, I do.

Look! Tom is too sleepy to work. He __________ up watching TV.

unday he promised ________ today, buthe hasn’t appeared yet.

We do jobs_____they need to be done and that could be early in the morning or late at night