— Let's go to the zoo on Sunday morning.— .
There are books on the shelf. And them is about three hundred.
Do you know what in the room at the moment?
---When shall we leave for Shanghai?---We won’t we have visited all the places of interest in Nanjing.
---How many students have visited Yangzhou Museum? ---____
--- What ________ useful book ! ---Yes, it is. But I found___________ difficult for me to read.