改错。选出并改正。（5’）
The bridgebuiltby the workers three years ago.
A     B     C                     D              (   ) ________
Watch TV too much is bad for your health.
A          B            C       D              (   ) ________
Shanghai is one of the biggest city in the world.
A       B      C    D                (    ) _________
Knives are usedforcut things.
A        B  C   D                           (    ) _______
Help  yourself to some bread,  children.
A      B       C     D                       (    ) _______