Question

-----chair is made of ------wood (a,an ,the )need expert advice​

Answer 1

Answer:

• the chair is made of a wood hope its help you

Answer 2

The Chair is made of wood. (between of and wood there will be no article.)

More information -

(a, an, the) are the Articles

Now uses of each -

'A' article -

$\sf It\:\: is \:\:used\:\:before\:\:a\:\:noun\:\:beginning\:\:with\:\:a\:\:consonant\:\:sound.$

Examples -

A horse, A tree. [here horse, tree are words that begin with a consonant sound.]

'An' article -

$\sf It\:\:is\:\:used\:\:before\:\:a\:\:noun\:\:beginning\:\:with\:\:a\:\:vowel\:\:sound.$

Examples -

An egg, An hour, an elephant. [here egg, elephant, and hour begin with a vowel sound.]

'The' article -

$\sf It\:\:is\:\:used\:\:before\:\:singular\:\:countable\:\:nouns,\\ \sf plural\:\:countable\:\:nouns\:\:and\:\:uncountable \:\:nouns.\\ \sf Uncountable\:\:nouns\:\:do\:\:not\:\:have\:\:plural\:\:form,\\ \sf e.g, we\:\:can\:\:not\:\:say\:\:'sugars', we\:\:will\:\:say, 'The\:\:sugar'.$

Uses of ''The'' -

• Talking about a particular person, thing; singular noun repeats the whole class; before the proper names, things of one kind; before a proper noun; in superlative degree; with ordinals; before musical instruments; before an adjective.

So, the chair is a countable noun.