He asked several questions_______ the professor who gave us a lecture_______the balance of nature.
Tony, mind your manners. Don’t _______ while others are talking.
________ seems to be no possibility _______ the shy girl can win the first prize in the contest.
________ in a new country, I was scared and feeling pretty anxious.
--What do you expect your son to succeed in? --- _________ the entrance exam.
Women prefer to think and then speak, while men like to speak as they _________.