no one, none, nobody

Front

___ knows the answer to this difficult question.

Back

No one / Nobody knows the answer to this difficult question.

Front

I looked around the room, but ___ was there.

Back

I looked around the room, but no one / nobody was there.

Front

___ of my classmates wanted to take part in the competition.

Back

None of my classmates wanted to take part in the competition.

Front

He knocked on the door, but ___ opened it.

Back

He knocked on the door, but no one / nobody opened it.

Front

___ of the books on the shelf belongs to me.

Back

None of the books on the shelf belongs to me.

Front

I invited many people to the party, but ___ came.

Back

I invited many people to the party, but no one / nobody came.

Front

She told me that ___ had called while I was out.

Back

She told me that no one / nobody had called while I was out.

Front

There was a lot of food on the table, but ___ of it was eaten.

Back

There was a lot of food on the table, but none of it was eaten.

Front

___ wants to listen to boring lectures all day.

Back

No one / Nobody wants to listen to boring lectures all day.

Front

Is there any sugar left? — No, there is ___.

Back

Is there any sugar left? — No, there is none.