1) People say that it's possible the missing plane crashed in the Bermuda Triangle.  a) it could have crashed  b) it had to have crashed 2) It's almost certain that those explorers were very brave. a) Those explorers must have been very brave. b) Those explorers can't have been very brave. c) Those explores might have been very brave. 3) If you ask me, there's no question that moving the statues took a lot of teamwork. a) moving the statues must have taken a lot of teamwork. b) moving the statues had to have taken a lot of teamwork.. c) moving the statues might have taken a lot of teamwork. 4) Scientists say that there almost certainly was a land bridge from Asia to North America thousands of years ago. a) Scientists say that there must have been a land bridge... b) Scientists say that there might have been a land bridge... c) Scientists say that there could have been a land bridge... 5) It's possible the noise we heard was the call of a wolf. a) The noise we heard might have been the call of a wolf. b) The noise we heard had to have been the call of a wolf. c) The noise we heard couldn't have been the call of a wolf. 6) DNA evidence shows that the Easter Islanders certainly didn't come from South America. a) islanders could have come from South America b) islanders couldn't have come from South America 7) Some people believe that it's possible that Shakespeare didn't write all the plays he is famous for. a) Shakespeare might have written all the plays he is famous for. b) Shakespeare might not have written all the plays he is famous for. c) Shakespeare couldn't have written all the plays he is famous for. 8) It's not possible that you saw a yeti because they don't exist! a) You might have seen a Yeti. b) You could have seen a Yeti. c) You couldn't have seen a Yeti. d) You must have seen a Yeti.

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