Choose the letter A, B, C or D to complete the sentences

The atmosphere on Mars is quite similar __________ that on Earth.

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“What subject do you find the most difficult?” My mother asked.

⇒ My mother asked what subject ____________ the most difficult.

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I can’t stand __________ with such a talkative person like her.

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Scientists think it is possible to send humans on a __________ to Mars by the 20130s.

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There have been some traces proving the __________ of aliens.

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Neil Armstrong is considered as the first person __________ on the Moon.

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Space __________ is the main vehicle for astronauts to travel on the Moon.

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I love __________ at pictures of the galaxy very much.