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2019-2020年高考英语一轮复习单元检测三MyFirstRideonaTrain外研版必修Ⅰ.语法填空AsachildIfrequentlytraveledacrosstheCanadaU.S.bordertovisitrelativeswithmyfamily.We__1__telltoletourparentstaketheluggagewhentheCustomsworkersaskedquestions.Thatsstillgoodadvicetodaybutitdoesneedsomeexplanationwellinadvance__2__whenitwillbeapplied.Anotherpreparationisnecessaryforsecuritycheckpointsespeciallyatairports.Childrenmightbee__3__confuseabouttheseprocedures.Yourgoalis__4__clearsecurityquicklyandefficiently.Helpyourchildrengetreadytogothroughthescreening.Answerquestionstheymayhaveabouttheprocedureathomeratherthaninfrontofthe__5__strange.Makesureyourchildrenhavesomethingtodo—anotepadandapenfordrawingorasimplegamewhichcanhelpreduce__6__bore.Snacksarealsoamust.Withtheunpredictability不可预测性ofmealsduringsometrips__7__isbesttohavesomehealthyinexpensivesnacks...。