— I’m new in Wuxi. — Take a map of Wuxi with you. You’ll find it of great ________ in helping you to get round Wuxi.
His grandpa ____ for five years.
Could you tell me _______?
The book is ____ useful one.
—Would you mind my using your computer? —______
I wonder __________ achieve a balance between my schoolwork and my hobbies.