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 will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".

I should (has to be) with them tonight.

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

To make a fuss about

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

To go off the air

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

Benediction

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

Incentive

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

Indiscreet

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

Belligerent

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.

The detective's ability to ________ makes it easy for him to scare suspects into confessing.