n problems such as energy crisis, pollution and populationexplosion_________, people are asked to share the bitterness and endure thehardship with all the whole nation of the times．

The Chinese exploration ship will join in the search for______ seemed like parts of the missing plane.

Thinking about how to finish her work on time while walking on the street, she was ____ by a bus.[ ]

Are you Meimei —

uvre in Paris is one of themost famous museums, housing many priceless _______.