Vocabulary is the most unstable element of a language as it is undergoing constant changes both in form and ____.

The meaning of the word “criticize” has changed from “appraise” to “find fault with”. Such a change is called ____.

The word “meat” originally meant ‘‘food’，，but now has come to mean “flesh of animals”. This is an example to illustrate ____ of meaning.

In grammatical context, the meaning of a word may be influenced by the____ in which it occurs.

The word “do” means “brush” in “do one’s teeth”，while it means “arrange” in “do the flowers”.The above example shows that____affects the meaning of a word.

Which of the following is NOT one of the major functions of context?

Which of the following is NOT one of the variations of idioms?

“Through thick and thin” is a(n)____.

There is a____in the idiom “by hook and by crook” as far as rhetorical features of idioms are concerned.

Webster's Third New International Dictionary is the best-known____dictionary.