I often go to school _________ 7:30 _________ the morning. [ ]

We must try our best to stop pollution ______ a low-carbon(低碳)life.

.“There is a great potential for the development of Sino-U.S. trade, ______ is in line with the interests of the two countries and their people,” Wu said

Everyone knows that China is famous__the Great Wall in the world.?[ ]

Mr. Wang _____ gets up early. So he is ______ late for work.