高二英语请将下列各句改写成过去分词的形式急
请将下列各句改写成过去分词的形式1.YesterdayMr.Zhanghadabarbercuthishair.
2.Thebridgewhichwasbuiltinthepastisstillingoodcondition.
3.Thoughhewaslaughedatbymanypeople,hecontinuedhisstudy.
4.Wedon'twanthumancloningthatareproducedbyscientiststoreplaceusoneday.
5.Manypeoplebelievethattheproblemsthatarecreatedbycloningwillsoonbeclear.