Direction: In the following passage, some of the words have been left out. First read the passage over and try to understand what it is about. Then fill in the blanks with the help of the alternatives given.
Pythons are 51 non-venomous snakes found 52 in damp places or rocky ledges near marshes or in dense 53. They are considered to be the most primitive54 the living snakes,55 they retain the traces of hind limbs of a 56 era in the form 57 horny claw-like spurs, which are present 58 either side of 59 anus. These hind limbs are functionless 60 female pythons.