-Is it OK if I have another cup of coffee? -Of course,_______.
She is doing her homework.I'll do_______.
Mary learned Chinese for about two years, _______is, from 1993 to 1995.
I hate ______ when people talk with their mouths full.
Few pleasures can equal _____ of a cool drink on a hot day.
I found _______impossible for _______to work out the maths problem.