We are short of clean safe drinking water, which is found to be the ______ in many third world countries.

The _______ are ten to one that we’ll win the match.

 His letter was so confusing that I could hardly make any        of it.

This is a new ______ to language teaching, which can stimulate students’ interest to learn the language.

. A(n) _____ of achievement clearly has an influence on children’s early education.