Many scientists have believed that there may be a _________of life on the Mar．

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• 1In public places, we can often see ______ that tell us useful things, such as no parking, no smoking, etc.

  A.symptoms

  B.signs

  C.systems

  D.signals

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• 2In 21st century universities in the US, there is little room for traditional literature because students feel a lot of _______ to study science.

  A.guidance

  B.pressure

  C.tendency

  D.restriction

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• 3She never loses _______ with students , which made her the most popular teacher in our school.

  A.balance

  B.patience

  C.independence

  D.experience

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• 4Please read the _____ on the bottle of the medicine carefully and pay attention to the amount and the time to take the medicine．

  A.explanations

  B.instructions

  C.introductions

  D.descriptions

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• 5You don't have to worry about the journey because I have made a ______ on the Indian Pacific train to Perth.

  A.reserve

  B.book

  C.preparation

  D.reservation

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• 6My neighbor is very kind. I'll never forget the ______ she's done for me.

  A.actions

  B.favors

  C.deeds

  D.Help

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• 7Bear in _____ that tomorrow is our dear mother's birthday．

  A.mind

  B.head

  C.memory

  D.heart

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