Correct the given sentence gramatically.

Shreya, who she is my best friend, is a singer.

In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word

Incarcerat

In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word.

Discordant

In the following question, out of the given four alternatives, select the one which best expresses the meaning of the given word

Arbitrary

In the following question, out of the given four alternatives, select the one which best expresses the meaning of the given word

Palliate

In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the fourand indicate it by selecting the appropriate option

She must ______ a great time at her birthday party.

In the following question, the sentence given with blank to be filled with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.

Ignoring someone in pain is an ______ act

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
 
1. Cybercrime cases pose various kinds of
2. Challenges which requires strengthening of
3. The institutional mechanism.
4. No error

In the following question, a word has been written in four different ways out of which only one is correctly spelt. Select the correctly spelt word