The rivers will become dirtier and dirtier _______ we take action to protect them.

The rivers will become dirtier and dirtier _______ we take action to protect them.

#55533

since

until

Unless

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Bill won’t make any progress_____he studies harder than before.

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when

because

unless

—Would you like to go for a walk with me, Allen?—I'd love to, ________you don't want to go alone.

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before

after

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but

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 ---          is the pen?          --- It’s black        red.

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What color; and

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