1) Scientists ____ ____ experiments to test their theories. 2) Writing an essay is a challenging ____ of work for students. 3) His plan ____ to some ____, but there were still problems. 4) A good teacher should be ____ ____ their subject. 5) If you study hard, you can ____ your teacher’s ____. 6) The north is cold and rainy. In ____, the south is warm and sunny. 7) The ____ ____ in politics are often about taxes. 8) Some people learn quickly, ____ others need more time. 9) She scored ____ in her class in mathematics.

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