The old man has retired from the factory. He _____ there for 30 years.
— Would you open the window , please ? — Yes , I ____ .
I''m surprised that he ____ to help me when I needed his help .
A lion ____ only attack a human being when it is hungry .
If you ____ me , I''ll give you some advice .
He looks very tired . He ____ to bed too late last night .