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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______ we deal with our problems, we can easily become unhappy.

#58561

Unless

Until

Though

Whether

－What shall we do now?－_______it’s raining hard, let’s stay at home.

#58311

Since

Though

I met a friend of mine _________ I was walking along the street.

#56938

before

because

since

You’ll be late __________ you don’t get up now.

#58328

before

until

after

______ he became seriously ill, he still went on working.

#58164

Unless

And

Even though

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