Choose the word which can be substituted.

The custom of having more than one husband at the same time.

Thousands of people have taken part in a ----------democracy demonstration. (Choose the correct prefix from the following)

Many medications have other -------- besides the intended one.

Choose the meaning of the given idiom

"To pick holes"

Find a word suitable for the expression "The style in which a writer makes a display of his knowledge".

My parents told me that I would have to ------- them when they become old. (Use appropriate phrasal verb from the following)