The chemical _____________ from cars and factories make the air, water and soil dangerously dirty.

He talked about the books and the authors ___________ interested him.

My friend, _________ aunt is nurse, would like to be a doctor someday.

They invited ______ to their golden anniversary.

Developments in micro-technology are bound to have a huge ___________ on various aspects of our life.

Endive can be used ______ as a salad green or as a cooking vegetable.

Miss White sang very ______ at my birthday party last night.

Dr Sales is the person _____.

Mr. Carter, to _______I spoke on the phone last night, is very interested in our plan.

Sulphur dioxide is one of several ____________that are released into the atmosphere by coal - fired power stations.