英语单句改错求解析A great many cities are experiencing difficulties,

A great many cities are experiencing difficulties, which are nothing new in the history of cities, except in their scale.

The bus driver didn't keep calm in the accident; otherwise,he mustn't have died and caused many others to die, too.

By reading instructions carefully, mistakes in the examination can be avoided.

Emma Lazarus, a poet and an essayist, wrote the sonnet inscribed on the pedestal of the Statue of Liberty.

Historians have long puzzled by dos, lines an symbols which have been engraved on walls, bones, and the ivory tusksof mammoths.