It depends. In most cases emails kind of have a professional stigma following them and are sent to ask questions or to gain information or inform the receiver so it’s best presented in a formal way.
In other cases such as a letter to a friend it can be as informal as the writer would like. Overall though I would say False, emails require professionalism.
C.
"Continues" takes the present tense and also applies that this work is continuous --> ongoing.
I believe the correct answer is the second choice: <span>We walked through the Red Oak Nature Center today; it was surprising how many bicyclists were there.
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I don't seem to understand your question