4.Researchers haven't found out what has.... in the pollution of the river. A.caused B.made C.resulted 15.Mai said she....a programme about Jupiter then. A.was watching B.watched C.had watched 16.I have won the gold medal. -.......... A.Well done B.I don’t understand C.That’s awful 18.A:Our house was destroyed by the storm B:........... A.Wow B.That’s a relief C.That’s awful

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