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He ran fast lest he should miss the train
He ran fast lest he missed the train
He ran fast lest he will miss the train
He ran fast lest he should have missed the train
Until recently Mars polar ice caps were thought to consist largely of carbon dioxide.
Martian polar ice caps are made almost entirely of water ice
Mars has many similarities to Earth, including the existence of polar ice cps.
Mars has only small fraction of the carbon dioxide found on Earth and Vnus.
The claim that there was once water on mars has only limited anbd indirect support from discoveries.
There were few significant discoveries.
The presence of water activity on Mars is related to the possibility of life on Mars .
the presence of certain geological land forms is not definitive proof that there was once life on Mars.
disproving a widely accepted theory
initiating a debate about the possibility of life on Mars .
presenting evidence in support of a controversial claim .
describing the various discoveries made convening the possibility of life on Mars.
may, have
should be, would not be able to
may be able to, having to go
none of these
I have ordered a few books.
He will arrive within three o'clock
I am in the jury
The train is running to time.
I had gone to the station
I would be going to the station
I would have gone to the station
I went to the station
the ability to make a financial success of everything
the ability to destroy everything
the ability to draw anything
the ability to capture everything
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