The agreement will b________both sides.

The agreement will b________　　　 both sides.

__________both sides accept the agreement will a lasting peace be established in this region.

A．If only            B．Only if            C．unless            D．As long as

 _______ both sides accept the agreement will the two countries live in peace.

  A. Only if           B. Unless             C. If only            D. As long as

_______ both sides accept the agreement will the two countries live in peace.

  A. Only if           B. Unless        C. If only      D. As long as