____is known to us is that China has won five gold medals in the 2010 Winter Olympic Games.
Lei Feng is always ready to help others when they are in trouble and he never _______ their request.
The TV set he _________ works well now.
There are a lot _______ people today than yesterday.
Wang Wei is one of many Chinese students _______ “on the go’.
With the development of science and technology, people’s life _______ in the past few years.