Anyone, whether he is an official or a bus driver, should be       respected.

We don’t have to keep these old chairs any more. ________, they are falling apart（支离破碎）.

Recent studies have discovered that fathers uniquely contribute to the development of their children, _____in low income families.

Although the new road is being used, it has not yet been _______opened.

The rapidly growing birth rate brings about a lot of environment problems, which the government is supposed to take _____.