The happiest thing for me is ______ what I know with others.

Shall we open the window to let some freshair in —_________. I’m feeling a littlecold.

eeply absorbed in work, ________ heoften was, he would forget all about eating or sleeping.

We are looking forward to _________ a chance to watch the opening ceremony of the Beijing 2008 Olympic Games.

________, the gathering crowd burst into applause.