--Can I help you?--I'd like to buy a present for my father's birthday, ___________ at a proper price but of great use.
To make members of a team perform better, the trainer first of all has to know their ________ and weaknesses.
—Could I borrow your dictionary? —Yes, of course you ________.
—The room is so dirty.________ we clean it? —Of course.
—Next week we’ll have the final English exam. —Yes. Then, every minute must be made full use ________ English.
—Can I help you, sir? —Yes. I bought this radio here yesterday, but it ________.