You must have worked the whole night yesterday, ____________ you look so tired. (but; for)
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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)
Tom brings a small bottle of eye-drop with him, ____________ his eyes feel dry. (because; but)
____________ you know the rules of grammar, you will be able to write correctly. (As; Although)