Solution:

It is mentioned that 'all but fifteen pencils' were used by him. This phrase means that except fifteen, all his pencils were used.

Thus, he is left with fifteen pencils.

Solution:

solution solved as below.

Solution:

I am word "Introvert"

Solution:

An apple a day keeps a doctor away :-)

Solution:

3 + 3 = 8 can be set true by moved to one of two solution.
A) 5 + 3 = 8
B) 3 + 5 = 8

Solution:

Happy Birthday To You

Explanation:
Happy + Bird(-d) + sunday(-sun) + to(2) + you(u)

Solution:

A pack of cards.

Solution:

What is the correct time ?

Solution:

"what" is the name of the ship.
The line says "What is the name of the Captain Jack Sparrow ship".

Solution:

The Stars