Although you may meet some difficuIties,you should never .
.—This math problem is too difficult. Can you show me _______, Dad?—Sure.
.— _________ city!— Yes.Tourists from all over the world come to visit it every year.
— Tom talked with a friend of _______ on the Internet for a long time yesterday.
— Can you play chess?— No, but I can play ________ piano very well.
—Would you like to join us in the game ?— , but I have to help my mum.