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.

None but _________ brave deserves the fair.

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

Remark: here adjective "brave" used as noun. "the brave" means "the brave people".

_______ gift she gave him was very expensive.

• A
• An
• The
• No article
Correct Option: C  [ The ]

Remark:

We have _________ University in our city.

• a
• an
• the
• none
Correct Option: A  [ a ]

Remark:

He met with __________ accident today.

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

Remark: The indefinite article "an" is used when word begins with a vowel sound.