Theory:

     “Good morning,” replied the crocodile politely. “I did come here in search of food for myself and my wife. Nice of you to offer me fruit.”
 
     The monkey plucked some from the nearest branch and threw them down. The crocodile found them delicious. “Thanks,” he said. “May I have some on my next visit?”
Explanation:
 
The crocodile was happy to hear such words from the monkey. It was overwhelmed by the monkey's gesture. Indeed, the crocodile was on the way searching for food. The crocodile wished the monkey, "Good morning," and politely spoke to it.

It informed the monkey that it was already searching food for itself and its wife. And so, the crocodile felt happy when the monkey offered the food.
 
Monkey offering food to crocodile.jpg
Monkey offering food to crocodile
 
On hearing this reply from the crocodile, the monkey plucked some of the fruits. It then threw them down to the crocodile. The crocodile was happy to eat those tasty fruits, and it thanked the monkey. Having tasted those delicious fruits, the crocodile had a thought. It requested to revisit the monkey to taste the fruits.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Indeed
In reality
2.
Delicious
Refers to a pleasant taste
3.
Politely
Refers to behaving in a respectful way
4.
Plucked
To take or pull something quickly from a particular place
Reference:
National Council of Educational Research and Training (2006). The Monkey and the Crocodile (pp. 20-24). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.