In the past twelve months the research members ______ the effectiveness of many materials in a home building.
—My sister is a typist at a foreign firm. —I know this sort of job ________ skill and speed.
He is such a man who is always________ fault with other people.
It is wise to have some money ________ for old age.
—Smoking is bad for your health. —Yes,I know.But I simply can’t ________.
His mother had thought it would be good for his character to ________ from home and earn some money on his own.