. From this simple concept ________ that has caused a great change in farming.

. He will tell us ________ he thinks of our arrangement.

. You can depend on ________ promise he makes.

. The main fact(or)s in human life are five: birth, food, sleep, love and death. (One could increase the number— add breathing for instance— but these five are the most obvious.) Let us ask ourselves ________ our lives.

. A look at recent trends in world fisheries reveals ________ the ocean on a global scale.

. A little learning is not dangerous so long as you know ________.

. Her unusual success shows that if someone can do their job really well, then the question ________ male or female is not so important.

. Linda was walking in the street ________ she noticed a thief stealing from a old lady.

. Mother was worried because little Alice was ill, especially ______ Father was away in France.

. He was just about to give up and return to his bedroom for a good rest ________ he had a bright idea.