We discussed the PPT in the afternoon ____________ we watched it in the morning. (after; so)
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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)
Have a good rest, ____________ you will recover soon. (and; if)
She looks very strong, ____________ actually she is rather weak. (but; so)