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.

#56392

since

until

unless

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 —Did you have a good time at the party?—Yes. We sang ______danced until late at night.

#57645

but

and

Don’t talk _____ drink in class.

#55261

and

but

More historical buildings in the old town will fall down ________we try our best to protect them.

#55384

since

unless

in order that

Jim, hurry up, ________ we’ll be late for the concert.

#58407

but

and

The game has _______ meaning _______ you do your best to win.

#55523

little; unless

no; if

a; until

no; whether

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