( ) A: ________ are you going this weekend?
B: I'm going to the Science Museum.
A. WhenB. WhatC. Where
( )I want to buy ________ shoes.
A. aB. a pair ofC. a pairs of
( )In China, drivers drive on the ______ side of the road.
A. rightB. leftC. middle
( ) The traffic lights are the ________ in every country.
A. sameB. differentC. difference
( ) ---Which floor?
---The ________ floor, Room 5A.
A. fiveB. fifthC. fiveth