—It rained cats and dogs this morning.I’m glad we took an umbrella.—Yeah，we would have got wet all over if we ________.              

— I heard they went skiing in the mountains last winter. — It ___ true because there was little snow there.

—Excuse me, where are we going to have our class meeting? —I’m not sure. Ask our monitor, please. He  __      know.

---I left my handbag on the train, but luckily someone gave it to a railway official.---How unbelievable to get it back! I mean, someone ______ it.

．—I did not know you were good friends．—You___．I have known her since she moved here．You were abroad then．