artificial underground passage. Passages under the ground often for cars or trains. To dig a hole from one side to another.

basic physical and organizational structures and facilities.

People who are in control of a business or group.

To give energy to something, e.g. by electricity.

From the beginning of something until the end. Over/across an entire place/thing; in every part.

place where passenger trains stop on railway line. Places where you can catch a train or a bus. (Army) to be posted to a place to perform duties.

at present time.

Group of homes built by government for poor people. To predict what will happen in the future.

curve formed by wire hanging freely from two points.

matter. Substances from which a thing is made.

flowing naturally or supplied to building through pipes and taps. The act of moving your legs to move quickly. (Of a road) to go from one place to another.

in existence or operation at current time. To be present, alive or real.

In a way that is obvious/easy to see or understand.

Above a person's head or in the sky. above level of head. Regular and necessary cost, such as rent and heat.

set of things working together as parts of mechanism. Sets of organized planned ideas that work together.