He could have helped us, but he ____ from coming in time by a traffic jam.
It is said that the software on learning subjects for pupils in a very practical way.
Our neighbor has ______ ours.
Atlanta, a Greek princess, was very beautiful and could run faster than ________man in Greece.
She could not speak, nor ______anything we said.
Why many adolescents (青少年) have trouble communicating with their parents lies in _____we call “generation gap.”