_______ many times , he still couldn’t understand it.
Our school is on the side of Chaoyang Road,our school is a large housing block where many people from the city live here.
--- Did you go for the Shanghai Expo? ---- I _____ to, but I decided to stay with my sick mother at the last minute.
With so much noise of the traffic, I couldn’t ____ and do my research work.
Zhang Yinying has trained continuously for six hours. ______ that she is tired out.
I wonder ______ that my children have picked up such words.