Put the verb in brackets into the Past Indefinite, the Past

Put the verb in brackets into the Past Indefinite, the Past Continuous and the Past Perfect. 1) When I_______________ (look) out of the window, the sun ______________ (approach) the horizon and dark clouds _______________ (overspread) the sky. 2) It already _______________ (begin) to grow dark; the cold autumn wind ___________ (whistle); clouds ______________ (creep) over the sky.