Nitrogen cycle is an important (a)   process in the environment. Measurement of total nitrogen (TN) is a routine experiment in researches in agriculture, biology and environmental sciences.

The relationship between plant and pollinator is a (a)   one.

Some foods (a)   more easily than others.

(a)   sports include swimming and scuba diving .

The chemical companies are poisoning our rivers with (a)   .

Agricultural (a)   containing pesticides is polluting the river.

When health inspectors investigated, they found no problem of kidney (a)   . Everything was poison-free.

There is a wide (a)   of views on this subject. People don’t agree on one point of view.

Heavy rain and (a)   use of fertilizers have impoverished and depleted the soil.