Jenny _____ China before. Jenny _____ China two years ago.

the many dangers_________– sailors have to face, probably the greatest of all is fog.

The students were ___ over the ___ problem,listening to the teacher with a____ expression on their faces.[ ]

What are the workers talking about — They are discussing the idea the old worker ______at the meeting yesterday.

A poet and artist_____ coming to speak to us about Chinese literature and paintings tomorrow afternoon.