Which one of the following words is in singular form?

Identify the word which remains the same in its plural form:

We must not be late,else we will miss the train.This is a--

He is the best boy in the class. Here "the" is a/an....

Shylock is a character in the play

'I will not let you go.' Here , 'go' is a/an-

When Ushashi entered--the room everybody stopped talking.

Who is the author of the first scientific romance 'The Time Machine'?

Call me if you have any problems regarding your work. Here, regarding is a/an-

Come on, it's time to go home.Here, home is a/an

Huffing and puffing,we arrived at the classroom door with only seven seconds to spare.Here, the verb "arrive" is -

Which one of the following is common gender?

"To win a prize" is my ambition-

Choose the word opposite in meaning to 'terse'-

Who's that?Here, 'that' is a/an-

What is the noun form of the word "know"?

"Give somebody a piece of you mind" means to-

"I shall help you provided you obey me".Here, Provided is a /an-

Which 'but' is a preposition?