-Could you help me put up the signs on the wall? -()
Every few ______ along the Great Wall there are some watch towers.
() is not a physical wall, but a lot of virtual data to protect the computer network.
-Could you help me put up the signs on the wall? -()
The top of the Great Wall is()for five horses to go side by side.
He thumbed through the rose ______ to see if there was anything he fancied for his south-facing wall.
China is()the Great Wall.
If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by ()
China is()the Great Wall.
The cylinder liner forming the cylinder wall and the inside of the water jacket is called a()