The patient could not decide what to do, ____________ he asked the doctor for advice. (but; so)
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I have to take a sleeping pill, ____________ I can't fall asleep easily at night. (otherwise; so)
You must have worked the whole night yesterday, ____________ you look so tired. (but; for)
He works as hard as others, ____________ he is in poor health. (although, when)
We discussed the PPT in the afternoon ____________ we watched it in the morning. (after; so)