Collocations for shocked - adj.

appear, be, feel, look, sound

extremely, fairly, very, etc.
badly (esp. BrE), deeply (esp. BrE), genuinely, greatly, profoundly, terribly, truly
The passengers were badly shocked but unharmed.

absolutely, completely, thoroughly (esp. AmE), totally, utterly (esp. AmE)
almost
a little, slightly, etc.
mildly
clearly, visibly

at
They were shocked at how the children had been treated.

by
She was visibly shocked by the conditions she witnessed in the camp.

Shocked is used with these nouns:
disbelief, expression, face, gasp, look, silence, tone