What's another word for 'probe.'?

ask, catechize, check, check out, check over, check up, delve into, dig, examine, eye, feel around, feel out, go into, inquire, interrogate, look into, look-see, , pierce, poke, prod, prospect, put out a feeler, query, quiz, scrutinize, search, sift, sound, sound out, study, test, test the waters, verify