--Hi, Mary!
-- Oh, it's you. Jack! I ______ you. You look like a star with the glasses.
| A．didn't recognize | B．don't recognize |
| C．haven't recognized | D．hadn't recognized |
Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.
| A．breakthrough; what | B．breakdown; which |
| C．breakup; that | D．breakthrough; which |
—Mary was being badly treated when John happened to pass by and helped her out.
—I think it was not a pure ________but had been well planned.
| A．coincidence | B．consequence | C．incident | D．chance |
Einstein’s Theory of Relativity was so __________that few people could understand it at that time.
| A．controversial | B．religious | C．abstract | D．contradictory |
Since entry into high school the students have been ____ staying up late in the evening and getting up early in the morning.
| A．admitted to | B．allergic to | C．accustomed to | D．attached to |
—Was it under the tree _______ you were away talking to a friend?
—Sure. But when I got back there, the bike was gone.
| A．that | B．where | C．which | D．while |