There ______ great changes in our hometown in the past fifteen years.
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.