—Is this your room?—______A.Yes,this is. B.No,this isn't. C.No,it isn't.
There weren’t____________houses here. A.some B.any C.something
There_____a clock here before. A.was B.is C.are
These bags ___________big. A.are B.is D.am
There was a house here______. A.after B.before C.now
Halloween is ___ autumn festival. A.a B.× C.an