Pop music is ____ an important part of society____ it has even influenced our language.

Most of the evidence was destroyed in the fire. _____, it would be almost impossible to prove Jim guilty.

I hate interruptions, _____when I ’m concentrating on my study.

— Have you finished your experiment report, Jane?— Oh, my God. I’ve _____ forgotten all about that.

_____ he graduated from college, he became a success in business.