(Hard) (as) he worked, (but) Mr. Black couldn't keep the shop (properly).

A．Your teacher tells me that you should study harder.
B．I've said before that the game takes too long.
C．Well, ah... You' re absolutely right to ask.
D．Sorry. Dad' s using the computer now.

A．Hold on a second, please. I'll put him on.
B．Sorry, Mr. Wang is not available fight now.
C．I am not sure because I don' t know what he is doing.
D．Thank you very much for calling.

A．How dare you invite me
B．I'd love to. Thank you.
C．Yes. But thanks anyway.
D．Whether I'll go or not is not your business.