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.

#55993

only if

until

so that

even though

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Although it is far , _______I walk to school.

#57087

but

It       Yang Liwei about 21 hours       the earth 14 times in his spaceship.

#57516

spent; circling

took; traveling

spent; to travel

took; to circle

--Lucy is doing her homework. ---Let’s ask Lily _______.

#58314

but

except

instead

instead of

You don’t know how difficult the job is,           you have done it yourself.

#55556

unless

since

because

It’s too late to go out now and        , it’s starting to rain.

#58089

though

besides

however

instead

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