Last year，five Chinese teachers_____to a school in the UK to teach the British students in Chinese style for four weeks．（ ）
A．was sentB．were sentC．have sentD．sent
What were you doing when I phoned you yesterday evening？
I _______ my homework．（ ）
A．was doingB．have doneC．did
Fifty yuan ________ enough．（ ）
A．isB．amC．are
My teacher asked me ________ the room．（ ）
A．cleanB．cleansC．to clean
Is this your pencil？Yes，it's _________．（ ）
A．myB．meC．mine
You'll have a great time ________ you go to the party．（ ）
A．soB．ifC．although