If, by any chance, the book ...... (should / happen / come) out of print before Friday, the publisher will ...... (be) really glad.
If, by any chance, the bookstore ...... (should / happen / sell) more books this year than last year, the owners will ...... (give) all the employees a big bonus.
If, by any chane, your sister ...... (should / happen / forget) about our agreement, will ...... (you / remind) her, please?
If, by any chances, the plane ...... (should / happen / take) off a little late tonight, the singer will ...... (have) to spend the night in a small hotel in the local town.
If, by any chance, the president ...... (should / happen / run) for office a second time, he will ...... (not / be) elected, I'm sure.
If, by any chance, the monkeys ...... (should / happen / escape) from their cages, the researchers' work will ...... (be) damaged.
If, by any chance, the football players ...... (should / happen / get) down with a serious flu virus, the coach will ...... (cancel) the next match.
If, by any chance, the anchor ...... (should / happen / announce) the news tonight, the producer will ...... (be) very surprised.
If, by any chance, the milkman ...... (should / happen / start) smoking again, his daughter will ...... (have) a hard time.
If, by any chance, the team ...... (should / happen / win) the tournament, there will ...... (be) a huge party on the main square.
If, by any chance, the cat ...... (should / happen / find) its way down from the top of the tree, the owner will not ...... (call) the fire brigade.
If, by any chance, you ...... (should / happen / see) my brother, will ...... (you / give) him the good news?