Please Check my corrections

Rewrite following sentences inserting suitable article(s), wherever necessary.

A. My grandfather had had hard life.

My grandfather had had a hard life.

B. She hit him in stomach.

She hit him in the stomach.

C. Queen had dinner with President.

The Queen had dinner with the President.

D. My friend is in hospital.

My friend is in the hospital.

Please check if the articles I have used to rewrite the sentences are right

Thanks