We have been good friends ________ we joined the same ping-pong team.[ ]

.“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

Where is Miss Wang now?—Look, there she is! She __________ with many old people.

He went to England by______ plane.

I would rather go to the country than ____.