A conjunctive adverb can join two main clauses. In this situation, the conjunctive adverb behaves like a coordinating conjunction, connecting two complete ideas. Notice, however, that you need a semicolon, not a comma, to connect the two clauses:
Choose the appropriate conjunctive adverb:
otherwise moreover then
The dark skies and distant thunder dissuaded Mary from her early morning run; __, she had twenty essays to correct for her afternoon class.
Karen’s apartment complex does not allow dogs over 13Kg; __, she would have bought the gangly Great Dane puppy playing in the pet store window.
The cat ate a bowlful of tuna; __, to the squirrels’ delight, the fat feline fell asleep in the rocking chair.