They ________ often _______to be careful before _______the road.
Mr Wang does what he can ________ us improve our English.
I want to know ________ he will be the volunteer in the 2011 Universiade (世界大学生运动会) in Shenzhen.
Many trees and flowers ________ in our city every year.
The basketball ________ I bought yesterday cost me 80 yuan.
Grandma is ill. I have to ________ her at home.