— They speak perfect English. How long have they learnt it?— _____

— They speak perfect English. How long have they learnt it?— ______ they were seven years old.

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Since

When

After

Until

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 Jeff’s sister can’t swim _________ dance.

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and

but

and not

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And

But

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because

unless

after

though

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but

because

These wild flowers are so special, I would do __ whatever ____ I can to save them.

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that

which

Whichever