Not until _____ his shoes did he enter one of the rooms of the Japanese house.
__ many times, but she still didn't know how to do it.
Scientists think that the continents ____ always where they ___today.
--- Would you tell me ___ you want your tea, with sugar or milk?--- Sugar, please.
Leaves are found on all kinds of trees, but they differ greatly __ size and shape.
He began to take political science_____ only when he left school.