Although he is very old, ________

Although he is very old, _________ he works very hard.

#56101

and

but

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She won’t lose weight______ she keeps a diet and takes exercise every day.

#55813

unless

because

since

Why was the house on fire? _______ lightning hit it.

#57989

Because

Since　

Because of

Some people won’t realize the importance of their health ______ they have lost it.

#58394

after

when

until

He didn’t take part in the sports meeting, ___he hurt his leg.

#58119

so that

because

because of

I won't come back _________August 5 and 7, so you’ll have to go there alone.

#57814

until

both

between

for

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