From space, the earth looks blue. This is ____about seventy-one percent of its surface is covered by water.

From space, the earth looks blue. This is ____about seventy-one percent of its surface is covered by water.

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why

how

because

whether

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Some people are holding their umbrellas ____ it is raining.

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in case

so that

as though

unless

Jeremy Lin’s success is more than coincidence. ________ talent, persistence and sweat can not be ignored.

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Except for

As well as

But for

But

You will succeed in the end _____________  you give up halfway.

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unless

now that

Until

Engines are to machines ________ hearts are to animals.

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that

what

which

There are fewer teaching positions left in big cities, ______ at the same time there are shortages of teachers in small towns．

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and

for

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