Water _____ on the mountains, we built many wells.A. was scarceB. scarceC. being sc

The boiler feed water check valves are located on the _____.

According to the old－timers, on two occasions ______.A．the water of the lake turned redB．l

There is an old temple ______ the foot of the mountain.A、atB、underC、belowD、on

The total quantity of water on Earth________.A.ha

Most of the fresh water on Earth________.A.is in

The house was very quiet ______ as it was on the side of a mountain.A.isolatedB.being iso