六年级5道单选题,需要解析.1.There ________ many high buildings in this c

六年级5道单选题,需要解析.
1.There ________ many high buildings in this city.
A.is B.are C.have D.has
2.–Can you come here next Monday?--Sorry,I________.
A.can B.don’t C.can’t D.am not
3.Did you ________ the video last night?
A.see B.watch C.look D.read
4.This room is ours,and that one is ________.
A.they B.them C.their D.theirs
5.Tom is __________ than Daming.
A.taller B.tall C.tallest D.the tallest