Hide﹣and﹣seek is___interesting game for children．（ ）
A．aB．anC．theD．/
Hi，Sara．Is this ______ English book？
No．______ is on the desk．（ ）
A．your； MineB．your；MyC．yours；MineD．your；My
It is necessary ______ us to help our friends out when they meet difficulties．（ ）
A．toB．ofC．withD．for
What did you do last night，Bob？
First I did my homework，and then I played ______ piano for half ______ hour．（ ）
A．the；aB．/；anC．the；anD．a；the
Our head teacher is responsible for his work．He spends most of his time with us．
________ He always communicates with our parents in his free time．（ ）
A．I hope so！B．What？
C．That's for sureD．Why？
I haven't seen your English teacher for a week．Where is he？
Sorry，I don't know _______．（ ）
A．where has he beenB．where he has been
C．where has he goneD．where he has gone