小题1: There is no doubt that this painting belongs to Zhang Daqian.
小题2: As time goes by , we have learned more ways to solve problems.
小题3:IOC stands for International Olympic Committee. But to be honest , I didn’t know it before.
小题4:At sight of his funny face, all people present burst into laughter .
小题5:The Peasant Movement Institute is a famous cultural relic of Guangzhou, which is worth a visit / is worth visiting / is worthy of being visited/ is worthy to be visited.
小题1:毫无疑问是：There is no doubt that ，that引导的是同位语从句。句意是：毫无疑问的是这幅画是张大千的。
小题2:随着时间的推移As time goes by,也可以说：with time going by
小题3:老实说to be honest, 也可以说：to tell you the truth.
小题4:大笑起来 burst into laughter,也可以说：burst out laughing
小题5:值得去参观一下is worth a visit / is worth visiting / is worthy of being visited/ is worthy to be visited. 或者：is worthy of a visit