Which of the following words is a root? （ ）

（ ）does not generally change the word-class of the stem but only modifies its meaning.

Relative synonyms also called（ ） are similar or nearly the same in denotation, but embrace different degrees of a given quality.

The idiom “live by one’s pen” is a（ ）as far as figures of speech are concerned.

Angel, martyr and paradise have their meaning（ ） because of the influence of Christianity.

The surviving languages fall into eight principal groups. Balto-Slavic, Indo-Iranian, Armenian and Albanian belong to the （ ）set.

Word-meaning changes by modes of extension, narrowing, degradation, elevation and（ ）.

There are（ ） functional words in the following sentence: It is fun to play with children.

The root of the word “internationalist” is （ ）.

There is（are） （ ） allomorphemic word（s） in the following words: cats, men, glass, worked.