Repeat is used before these nouns:
business, customer, offender, order, performance, prescription, showing, visit

just, merely, simply
There is no point in merely repeating what we've done before.

again
ad nauseam, constantly, continually, endlessly, indefinitely, over and over, over and over again
That message was still being repeated ad nauseam on the radio.
They constantly repeat the same mistakes.
A single note repeated over and over again, throbbing in my head.

consistently, frequently, often, persistently, regularly
exactly, faithfully, word for word
She faithfully repeated everything he had told her.
He repeated what she had said word for word.

mechanically
slowly
quietly, softly
loudly
patiently
stubbornly
firmly

can only
I can only repeat what I have already said to other journalists.

be necessary to, need to
It may be necessary to repeat the dose several times to effect a cure.

after
The students repeated each sentence after their teacher.

to
You must not repeat this to anyone.

keep repeating sb/sth
She kept repeating it over and over again like a robot.

Repeat is used with these nouns as the subject:
cycle, history

Repeat is used with these nouns as the object:
argument, assertion, call, cycle, demand, episode, error, exercise, experiment, feat, instruction, mistake, motion, pattern, phrase, procedure, process, refrain, request, sequence, success, warning, word