—What were you doing when I phoned you last night? —I      my painting and was starting to take a bath.

 Just look at the room. My roommate ____ up his clothes.

—Tom, have you finished your homework? —Yes, I ________ before you came back, mom.

---I didn’t go to Mary’s party last night because my car broke down.---You could have borrowed mine. I ______ it.

 “Life is like walking in the snow，”Granny used to say，“because every step ________.”(2012·新课标全国)