Correct the given sentence gramatically.

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

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.
Pillar to post

In the following question, out of the four alternatives, select the word opposite in meaning to the word given.
Commiserate

In the following question, out of the four alternatives, select the word opposite in meaning to the word given.
Ostentation

In the following question, out of the four alternatives, select the word similar in meaning to the word given.
Haggard

In the following question, out of the four alternatives, select the word similar in meaning to the word given.
Boisterous

In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
My sister unlike my brothers __________ to have a career in Engineering.

In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.
John as well as his friends always _____ the permission of his mother before going for a rugby match.

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'.
Our office building comprises (1)/ seven floors and a restaurant at the top in an (2)/ area of about eight hundred sq. metres. (3)/ No Error (4)