----Is this the first time you _____Chengdu ?----No. But the first time I _____here, the city wasn't so beautiful.
The design of the modern architecture concentrates on usefulness _____ decoration.
I’d rather have a room of my own, however small it is, than _______ a room with someone else.
—— Would you mind my having a talk with you? ——- ______________. You are welcome
E-mail, as well as telephones, ________ an important part in daily communication.
Mark woke up one morning only to find both water and electricity _______ because he had not been able to pay the bills.