（ ）1．(2016年黄石改编)— What did you do last night, Bob?
— First I did my homework, and then I played ______ piano for half ______ hour.
A．the；a B ．/；an C．the；an
（ ）2.（2016年怀化）—Does your mother go to work by bike every day？
—No．She sometimes takes ． bus
A．a B．an C．/
（ ）3.（2016年永州）I find___ pen on the ground．Whose is ___ pen?
A．a；the B．the；a C．a；a
（ ）4.（2016海南）—Excuse me. Where is ________ school library?
