Can I go to the museum this Sunday— No. It is ______ only from Monday to Friday.

John and Tom, you two clean the classroom today, _____? —But we cleaned it yesterday.

Nowadays everyone is responsible for________a harmonious society in China.

_________ the fact that many drivers are ever trained, we cannot stress too much theimportance of traffic safety

(2013·陕西重点中学高三二模)We pursue happiness, thinking one day we will find it. But ________ it by seeking it.