Yalu river forms a natural 【boundary 】between Chi

This river forms a natural _______ between China and KoreaA.boundaryB.stringC.spotD.zone

The ______ law did not make a clear distinction between the new and old land boundary.A．ad

On Samhain the boundary between the living and the dead was obliterated by______.A．the dea

______lie（s)between the boundary of Canada and the U. S. and serve（s)as the boundary betwe

______are located on the U. S.A.-Canadian boundary between Lake Erie and Lake Ontario.A．Ni

______forms a natural boundary between Mexico and the United States.A．The Rio Grande River