Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Can you count the number of quadrilaterals in the picture below?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Solve the rebus riddle in the picture below.

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Make a sentence consisting of three words that have the whole alphabet.