Excuse me， can you tell me the way to the nearest underground station？
Walk straight on you see a white building． It's right there．（ ）
A．thoughB．sinceC．untilD．if
I don't know he will come or not this afternoon．（ ）
A．ifB．whenC．whether
﹣ did you write to last night？﹣A pen pal．（ ）
A．WhatB．WhereC．Whom
She is listening to music he is doing his homework．（ ）
A．afterB．beforeC．while
He is at English than me．（ ）
A．goodB．betterC．best
It's our duty our hometown clean and beautiful．We must do something for it．（ ）
A．keepingB．keepsC．to keep