Scientists are hoping for a _____ in the search for a cure for cancer.
As he was __________ tired, he couldn't help __________ the housework.
— MrWang, I'm afraid I can't finish the report within the week. — __________. How about next week?
—Whydo you suggest we buy a new machine? —Because the old one has been damaged __________.
The house is easily __________ from the rest. It has alarge blue door.
I haven't seen Sara since she was a little girl, and she has changed beyond __________.