Question

He wanted to concentrate
..........something good that I had.
​

Answer 1

Answer:

on

Explanation:

he wanted to concentrate on something good that I had

Answer 2

Answer:

He wanted to concentrate on something good that I had.

Explanation:

A Preposition is a word which usually precedes a Noun or Pronoun. It helps in expressing a relation to another word or clause.

For Example: above, across, against, along, among, around, at, before, behind, below, beneath, beside, between, by, down, from,

On preposition is used in the following cases:

1. In Time Expressions:

'On' is used as a preposition in time expressions with specific days of the week.

For Example: I will see you on Wednesday.

2. Places

'On' is used for flat surfaces both big and small.  'On' is also used with planets.

For Example:  

• The pen is on the table over there.

• Traces of life was found on Mars.

3. On Condition

'On condition' is used to establish something that must be done in order for something else to happen.

Therefore, the answer is:

He wanted to concentrate on something good that I had.