单项选择题

On every formal occasion, they strictly ______ the formalities.

A．hold in
B．hold to
C．hold down
D．hold over
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You must exert yourself ______ anything.
A．achieving
B．to achieve
C．to achieving
D．achieve
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Theoretically speaking, there are dangers ______ in almost every sport.
A．adherent
B．coherent
C．cohesive
D．inherent
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