Tom brings a small bottle of eye-drop with him, ____________ his eyes feel dry. (because; but)
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____________ 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)
Some say the doctor is merciful, ____________ others say he is killing people. (while; because)