Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.

Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.

#55316

only if

until

so that

even though

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_______he is only 8 years old , he knows more about science than his father .

#58447

But

Though

Because

You’ll fail your next English exam _______ you work harder from now on.

#55127

whether

until

unless

-What do you think of these flowers？-They are           beautiful          I love them very much.

#56340

such;that

too;to

so; that

enough; for

Planes will be very large______ flying will be very cheap.

#56584

because

but

and

I never know this         he tells me.

#56807

after

when

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until

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