Complete the following passage by choosing the most appropriate option from the ones given below.
Today we wear mask on special (i) ____________________such as fancy-dress parties. However, in ancient times, masks were used for some religious (ii) ______________. For instance, in Africa, witch doctors wore masks to cast (iii) _____________________ evil spirits, which they believed were the cause of diseases in both human beings (iv)_____ animals.

i. (a) dates (b)occasions (c)nights (d)ages
ii. (a) purposes (b)date (c)parties (d)policies
iii. (a) in (b)into (c)up to (d)out
iv. (a) of (b) but (c) and (d)or