In the following questions, in the following passages some of words have been left out. Read the passage carefully and choose the correct answer to each question out of the four alternatives and fill in the blanks.

Tennis is a game that gives one plenty of exercise; It develops ___(21)__ of eye and limb and ___(22)___the brain too into___(23)___. A few sets of tennis keep one physically and ___(24)___fit. But for the indoors, chess is the queen of games. People say chess is a __(25)__game because only two can play.

Fill in the blank at (24).

Which cobble is used to send modulated light?

When is International Human Unity Day celebrated?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
15, 26, 48, 81, 125, ?

A shopkeeper sells a watch set on discount of 8% of printed price and gain 25 %. If marked price was Rs. 20,000 then, what was the cost price?

A sells a good to B at a profit of 20% and B sells it to C at a profit of 25%. If  C pays Rs. 225 for it, what was the cost price of A?