单项选择题

Students or teachers can participate in excursions to lovely beaches around the island at regular ______.

A．gaps
B．rate
C．length
D．intervals
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Maria specializes ______ mothers with their children.
A．for painting
B．with painting
C．in painting
D．to painting
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He was obliged to adapt himself ______ the habits and customs of Byron.
A．with
B．into
C．of
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