_____it’s late at night,______my father is still working.
-When _______ your mother _______ you that blue dress, Mary?-Sorry, I really can't remember.
You can't watch TV _______ you finish your homework.
They were _______ busy _______ with each other to remember the time.
Miss Taylor never wastes money on anything too expensive, even though (尽管)she can _______ to. She has donated much of the money she saved to charities.
-Can he get the first prize for running?-Impossible now. He _______ so, but he has just hurt his leg.