C. Fill each blank with a suitable preposition to complete the passage below. (1.6 pts)

Last summer my husband and I had two Italian students to stay at our house in London. It was a kind (51)___________ exchange , with our two children off to Rome this summer, giving me, incidentally, an interlude of peace (52)___________ which to write this newspaper column, among other things. But back to the two Italians, two charming girls whose English was a revelation to everyone in our family. I am not going to say that it was perfect or anything (53)___________  that, simply that they used expressions that have either long ago died out (54)___________ these islands, or are greeted when used with blank incomprehension. For example, when a day or two (55)___________ their arrival Lucia made some coffee and handed it (56)___________ my neighbor (who had come round to see why her husband kept popping over to brush up his Italian), she unmistakably said “Here you are”. The shock was so great that we both nearly fell (57)___________ our chairs. (58)___________ the benefit of foreign readers, or for anyone who has just returned from a monastery or a few years on Mars, I should explain that this now quaint English expression has long since been replaced (59)___________ the transatlantic “There you go”, an utterance which threw me (60)__________ considerable confusion when first used by hairdressers, waitresses and barmen. The two girls also surprised us by asking intelligible questions instead (61)___________ making vague statements which were supposed to be taken as questions. And they had retained that ancient habit (62)_________ addressing strangers by their surnames, preceded by a “Mr” or “Mrs”, as in “Good morning, Mrs Scott”, rather than greeting me (63)___________ the door (64)___________arrival with a “Hello, Gloria, and have a nice day.” All (65)___________all, they were a delight, although I am sorry to report that (66)___________ the time they left, they had absorbed what passes as the English language hereabouts, and had plunged downhill towards unintelligibility. Oh well, there you go, I suppose.