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By improving reading skills, you can read faster and understand more of what you once ________ impossible to understand.

[  ]
A.

think

B.

thought

C.

had thought

D.

are thinking

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When we think about giving help to developing countries, we often think about giving money so that these countries can build schools and hospitals, buy food and medicine, or find clean water supplies. These seem to be the most important basic needs of the people we are trying to help. However, it's far from enough. Ladies and gentlemen, we've got to come up with some better ideas to help them.
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C
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