I am looking forward .......... buying a new car next month.
Answer: to

‘Look forward to’ is a fixed phrase where ‘to’ is always followed by a noun or gerund.

My nephew is married a famous actress.
Answer: to

‘Married to’ is the correct prepositional phrase used to indicate who someone is married to.

Can you find our town the map.
Answer: on

‘On’ is used for locations on flat surfaces like maps.

Please turn the volume of the music, I am getting deaf
Answer: down

Turn down’ means to reduce the level of volume, heat, or light.

Your absence was fatal our plans.
Answer: to

‘Fatal to’ means causing harm or ruin to something.

He is blind reason.
Answer: to

‘Blind to’ means ignoring or not recognizing something.

Success consists hard work.
Answer: in

‘Consist in’ is used to show the essential element of something.

Do not jeer the poor.
Answer: at

‘Jeer at’ means to mock or make fun of someone.