A model or an experiment in a science class can help us see things which would_______ remain hidden.

When knowing there was a panda in the zoo, the children could _____ wait to see it.

Although the new road is being used, it has not yet been       opened.

A good article should not only be rich in the use of language, but also it ought to be ________ organized. 

He has decided to settle ______ in France because he is fond of the romantic country.