Copper is __________ Useful metal. (appropriate article)

• a
• an
• the
• Zero article
Correct Option: A  [ a ]

Remark: "a" is correct because "useful" starts with a consonant sound. "An" is used before words that start with vowel sounds.

It is a long drive to _______ airport.

• an
• the
• a
• no article is needed
Correct Option: B  [ the ]

Remark:

He is _______ honourable man.

• a
• an
• the
• zero article
Correct Option: B  [ an ]

Remark: "honourable" starts with sound of "vowel"

Let us discuss _________ matter seriously.

• the
• an
• a
• no article
Correct Option: A  [ the ]

Remark:

It is _______ half past six by my watch.

• the
• an
• a
• no article
Correct Option: D  [ no article ]

Remark:

The boy is studying in ____________ university.

• a
• an
• the
• zero article
Correct Option: A  [ a ]

Remark: "a" is used with "university" ( Vowel word with a consonant sound.)
similar: a one-act, a one-eyed, a one-man army, a union.

She did _______ MA in French literature.

• an
• a
• one
• None of these
Correct Option: A  [ an ]

Remark:

Did you get married after leaving ________ University?

• an
• the
• a
• No article required
Correct Option: B  [ the ]

Remark:

Tell them not to make _______ noise.

• the
• an
• a
• no article
Correct Option: C  [ a ]

Remark:

English is the mother tongue of _________ English.

• a
• an
• the
• none of these
Correct Option: C  [ the ]

Remark: "English" in this context, refers to the language.

"The English" refers to English speaking population in that region."