—Are you taller than your cousin, Mike? —No, I am as ______ as him.
--- Have you solved your problem?---I've kept on thinking about that matter ______, but I have no idea yet now.
I am surprised to see you not smoking. You ______.
--- The two old friends were ______ busy ______ with each other ______ the time.--- Yes. They hadn’t met for long.
______ of the students in my class plan to go abroad for ______ study in the future.
Sound travels ______ air ______ a speed of about 340 metres per second.