It is illegal for a public official to ask people for gifts or money _____ favors to them[ ]

Clearly, in a system _________ every decision is made on the basis of tradition alone, it may be difficult to achieve progress.

How ______is your father——He is 40.

The first quarrel between a young couple is the beginning of a new stage, ______ poetic love is transformed into practical life.[ ]

Where will you start your work after graduation?—Mmm, it’s not been decided yet. I ____ continue my study for a higher degree.