All the members of the WTO should follow the ______ of trust and fair(公平) trade.

The environmentalists said wild goats’ __________ on the vast grasslands was a good indication of the better environment.

The children have been playing with my hat －they’ve knocked it out of ______.

Quite a few people like traveling, for it can increase their knowledge and broaden their _____．

To her ________，the salesgirl still helps that old lady.