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用since或for填空。1.Ihavebeenwaiting____________twohours.2.Thewomanhasbeenplayingwiththedog__________thismorning.3.Hehasbeenlearningaforeignlanguage____________eightmonths..4.Mr.Liuhasbeenteachinginthisschool____________1994.5.Thetelephonehasbeenringing_____________twominutes.6.Themanhasbeencollectingshells______________manyyearsago.7.Ihavebeenreadingthenovels_______________yesterdaysmorning.8.Ithasbeenraining__________latelastnight.9.Mystomachhasbeenaching__________severalsdays.10.Theboyshavebeenplayingsoccer___________thewholeafternoon.11.Thebabyhasbeencrying____________earlythismorning.12.Theteachershavebeensittinghere___________westartedaboutanhourago.13.Ihavebeenplayingtennis___________Iwassevenyearsold.Keys：1.for2.since3.for4.since5.for6.since7.since8.since9.for10,for11.since12.since13.since