How old (41) you be on Friday 13, 2029? That is how old you will be when a large asteroid, called Apophis, comes very, very close to (42) planet. Asteroids are rocks that circle the sun in space and sometimes (43) close to Earth and even hit it. Most asteroids are very small and, if you are lucky, youcan sometimes see (44) in the night sky as ‘falling stars’. However, most scientists (45) ) one large asteroid, about six to twelve kilometers across, hit the earth and killed all the dinosaurs about 65 million years ago. Apophasis is also big. Scientists (46) it (47) 2004 and they say that it is about 300 meters across. That’s about the size of a large sports stadium. An asteroid this size, according to scientists, is (48) ) large enough to destroy our world, but it is large enough to destroy several cities. It will probably miss the earth, they say, but not by very much – it will miss (49) ) by about only 35,000 kilometers – that’s much closer than our moon which is about 240,000 kilometers away. Another way of thinking about it is that it will (50) ) us by only a few minutes.

41.A. are B. will C. do D. can

42.A. our B. us C. ours D. we

43.A. came B. comes C. coming D. come

44.A. they B. their C. them D. they’re

45.A. believe B. believed C. believes D. believing

46.A. discovering B. discovered C. discover D. discovers

47.A. on B. at C. in D. to

48.A. no B. don’t C. isn’t D. not

49.A. we B. us C. our D. ours

50.A. missed B. misses C. missing D. miss