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.
To wrangle over an ass's shadow

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

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

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

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

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.
He was too _____ to make a statement before the Boss.

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.
Both taciturn and _____ , Daniel seldom spoke and never spent money.

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'.
The Manager warned his team members (1)/ that if they persist in their (2)/ obstructionist attitude they would be punished. (3)/ No Error (4)