In hot summer, milk quickly turns sour it is refrigerated.

In hot summer, milk quickly turns sour       it is refrigerated.

#31564

while

until

unless

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We wouldn’t go abroad for our vacation _______ we could afford it.

#32210

as if

so that

in case

even though

.A computer is so useful a machine ________ we can use everywhere.

#80155

that

which

what

Tom had been studying French hard for nearly three years    he mastered it．

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after

when

since

before

The little boy won’t go to sleep_______his mother tells him a story.

#31821

unless

but

whether

 Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.

#30278

until

now that

unless

even though

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