15. He is better than _______ I last visited him.
There are now many museums showing ______ life was like back then.
By the time you get to Beijing tomorrow, I ______ for Shanghai.
There is much ______ can be done about the accidents ______ from carelessness.
The time is not far away ______ modern communications will become widespread in China’s vast countryside.
Most parents encourage their children to take an active part in social events, ______ those events do not interfere with their studies.