用since,for,ago填空 1.he stayed with us ( ) two weeks.2.she arrived two weeks ( )
3.i have not seen him ( ) monday.4.he has been ringing up continually ( ) lunchtime.5.we waited ( ) ages.6.he left a month ( ) and i have not seen him ( ) then.7.it has not rained ( ) march.8.my grandparents lived here a long time ( ).9.i have not heard from him ( )1993.10.we have been working on this new plane ( ) over a year now.