It's polite to let old people stand ______ you when you are waiting in a queue(排队).

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It''spolitetoletoldpeoplestand______youwhenyouarewaitinginaqueue(排队).It''spolitetoletoldpeoplestand___

It's polite to let old people stand ______ you when you are waiting in a queue(排队).
It's polite to let old people stand ______ you when you are waiting in a queue(排队).

It's polite to let old people stand ______ you when you are waiting in a queue(排队).
before

It's polite to let old people stand ahead______ you when you are waiting in a queue(排队).