Danny was having fun singing in front of his class.  He has a lot of what?\nOptions:\n- laughter\n- being happy\n- glee\n- opera\n- injuries
Let's think step by step below.
glee
Glee means great delight.

One would be very delighted to perform singing in front of a lot of people.

There will be a lot of students in a class.

.

The final answer: glee