Your sentences all err on one side or the other. #1 and #2 admit of no omissions, but #3 and #4 require more, and all should read thus: 1. The busier she is, the happier she feels.
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64801965"The more learned a man is, the more modest he usually (is)." people know the is following usually well so it can be ommited due to avoiding repetitionNo, "is" is required in this sentence.
64801965The more beautiful a woman looks, the more unfortunately she (is).This doesn't make sense, with or wit