Have you decided _________ Shanghai?
I don’t know ______to do with the maths problem. It’s too hard.
—Thank you, Mille and Kitty. It was kind of you to help me with my lessons.—_______.
— ________ useful tool the computer is! — I agree. It’s ______ interesting as well.
On Sundays, she prefers ________ at home alone ________ with her friends outside.
Her father is a professor in________university in our city.