--- I _____ read this book _____ I understand it.--- You are great, I should learn from you.
—Do you know who cleaned the blackboard,Tina?—Yes,John________.A.doB.doesC.did
Lee________all night in order to watch the football match between France and Italy.
—How was the________last Sunday?—It was sunny.
Mr Jackson keeps lots of________on his farm.
—________did you go last summer vacation?—To the beach.