Many important leaders of different countries______ in the opening ceremony of the 29th Olympics held on August 8,2008.

Mary doesn’t play soccer. She only watches them _______ TV.

Study hard, _____ you are sure to have a good result in the exam.

do English peopletalk so often about the weather when they start a conversation— Well, it’s probably theweather is a __________topic.

Traffic restrictions have come into effect in Beijing ______to improve the capital’s air quality and traffic situation for the 2008 Olympics