Articles (the, a/an, no article)

1

100

I like apples.

correct! We don't use articles before plurals

200

He is the doctor I'm seeing today.

Correct - you are talking about a specific doctor.

300

All you need is the love.

Wrong, we don't use the before abstract nouns.

400

-Where is Mary?

-She is in the hospital. 1

-Why?

-She had an accident. 2

1 - wrong - she is in hospital - fixed expression, she is in hospital for treatment

2 - correct - an means one

500

Is the food good?

correct - we are talking about the food the person is eating now.

2

100

I am going to Canary Islands for holiday.

Wrong - the Canary Islands.

200

When in Rome, you must visit Colosseum. 

wrong - the Colosseum - there is only one Colosseum.

300

I have news! I'm going to be a father.

Correct - mother and father are like jobs, you are mother, you are a father, an uncle etc

400

I live in city centre.

Wrong - fixed expression: in the city centre.

500

Owls are awake at the night

Wrong - at night (fixed phrase)