Whenever we were ___, he is always ready to ___ us some help.
--- 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.
I can't say which wine is best-it's a (n) ___ of personal taste.
---May I ask for a leave,sir? ---sorry,the meeting _____ no absence.