—How many people attended the exhibition?—I’m not sure. _____ speaking, a thousand or more.

 Not ______ openly may make one’s point confusing, while careless words are ______ to hurt others’ feelings.

Letters to the editor must carry the writer’s full name, which indicates that writers are _____for what they say．

Over the river there is ____________ bridge.

The British Museum, I think, is ________________ during the summer break.