---- Has Sam finished his homework today? ---- I have no idea. He ________ it this morning.
. 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.