在必要的地方填上for或since.
1.1.Mymotherhasworkedinthishospitalever____________itopened.
2.Wefinishedourhomework_______twodaysago.
3.JohnhasstudiedFrench_________threeyears.
4.UncleLihasbeenhere________tenyearsago.
5.TheywenttoLondon________justover5months.
6.Wehaveknowneachother_______wewerechildren.
7.Thetrainhasbeenaway_________halfanhour.
8.ShehasbeenaLeaguemember_________oversixyears.