The fall in the number of deaths from heart disease is greatly（ ）to improvements in diet.

The fall in the number of deaths from heart disease is greatly（ ）to improvements in diet.
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    John could not give a（ ）explanation for his strange behavior.

    John could not give a（ ）explanation for his strange behavior.
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      After so many years, their handwritten signatures on the contract are still（ ）.

      After so many years, their handwritten signatures on the contract are still（ ）.
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        When the sales staff finished with their presentations, the manager asked some（ ）questions on the project.

        When the sales staff finished with their presentations, the manager asked some（ ）questions on the project.
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          Honeybees use one of the most（ ）communication systems of any insect.

          Honeybees use one of the most（ ）communication systems of any insect.
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            We'll visit China next spring, （）we have the money.

            We'll visit China next spring, （）we have the money.
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              He knows little of mathematics, and （）of chemistry.

              He knows little of mathematics, and （）of chemistry.
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                Personal computers are no longer something beyond the ordinary people; they are（ ）available these days.

                Personal computers are no longer something beyond the ordinary people; they are（ ）available these days.
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                  The teacher told the students to stay in the classroom and they did（ ）.

                  The teacher told the students to stay in the classroom and they did（ ）.
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                    The elderly lady was （） sorry for what she had said to the shop assistant.

                    The elderly lady was （） sorry for what she had said to the shop assistant.
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                      It is questioned whether the teachers should work （） from the officially approved primers.

                      It is questioned whether the teachers should work （） from the officially approved primers.
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                        These arguments have never been （） accepted.

                        These arguments have never been （） accepted.
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                          Banks （） receive money from their customers in two distinct forms: on current account, and on deposit account.

                          Banks （） receive money from their customers in two distinct forms: on current account, and on deposit account.
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                            Elizabeth swims so （）, as if it's the easiest thing in the world.

                            Elizabeth swims so （）, as if it's the easiest thing in the world.
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                              I'm（）sorry for what I said. I really am.

                              I'm（）sorry for what I said. I really am.
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