— Would you say something more about it?— I’m afraid I can’t. I only know much.
----I am sorry to have ____ too much of your time.----That's OK, and I am glad to help you.
Mary and her friends paid_____visit to _______Summer Palace yesterday.
It was back home after the experiment.
is believed that improvement in health care will lead to a stronger , more prosperous economy .
----May I smoke here ? -----If you , choose a seat in the smoking section .