Hold one's tongue

Answer: Option B

Explanation:

Example : I advised him to hold his tongue before teacher.

1. Full tilt

Answer: Option A

Explanation:

Example : As exam are coming near he is studying with full tilt.

Answer: Option C

Explanation:

Prejudice means Preconceived opinion not based on reason or experience.

Example : You must not evaluate anything with a jaundiced eye.

Answer: Option C

Explanation:

Example: I am at a loss to know what to do.

Answer: Option A

Explanation:

Example : Many successful entrepreneurs have a hold and corner method for dealing with people.

Answer: Option C

Explanation:

Example : Even the intervention of their leader proved a damp squib to resolve their matter.