___ most of the earth’s surface is covered by water, fresh water is very rare and precious.

___ most of the earth’s surface is covered by water, fresh water is very rare and precious.

#31448

Although

Once

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The problem of the present world is that those who are imaginative have little experience_________those who are experienced have weak imagination.

#31024

unless

although

because

while

He had his camera ready ____he saw something that would make a good picture．

#32059

even if

if only

in case

so that

_______ we got to the station, the train had left already.

#30920

Unless

Since

When

I was just at the school gate    the bell rang.

#31042

while

because

when

I had been puzzled over the problem for over an hour without any result,      all at once a solution flashed across my mind.

#33232

while

when

then

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