Answer: However
"However," is a common transition because it relates the following idea to the previous one by implying that something you wouldn't expect given the information beforehand has occurred.
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Answer:
an architect was very famous as he always ordered exactly enough materials for every building he built. he as well as his workmen were
I think it's B, because they do not know of their last names yet, so they're just happily kissing one another.
Comparing two countries...
