填空题 下面是关于某博物馆的三对句子。每对句子中，第一句是原句，第二句是对第一句的改写。要求根据原句和第二句中已经给出的部分补全第二句。(注意，不能改变原句的意思。)

填空题 People say this museum is great.
It 1 2 that this museum is great.

填空题 It was finished 15 years ago.
It was 1 finished 2 1991.

填空题 Visitors from home and abroad can visit it.
It is 1 2 visitors from home and abroad.