16.It is no doubt that once ____ this city, you’ll find that there is so much surprise waiting for you to discover. visit B. visiting C. visited D. to visit
. Charles Babbage is generally considered _______ the first computer.
. The missing boys were last seen _______ near the river.
. The patient was warned _______ oily food after the operation.
. I regret _______ you that we are unable to offer you employment.
. You had better get a doctor _______ your bad tooth.