dutiful造句
31) He is always a dutiful person, so will not go off the rails.
32) Your electric toothbrush will beep to notify you that dutiful brushing twice a day every day for the past six months has earned you enough points for a 10 percent discount on your next checkup.
33) He wonderfully cheered up , his dutiful manner vanishing in a great grin and a strong hug.
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