He is doing housework.

I thought his story was completely an unrealistic fantasy.

She confided her secret to him.

My lesson is piano.

He holds the power of life and death in that country.

To declare an integer type variable, use 'int'.

He has psychopathy, making it difficult for him to understand social rules.

The Xisha Islands are one of the beautiful islands in the South China Sea.

Sex chromosomes play an important role in determining the sex of an organism.

Sex chromosomes play a crucial role in determining the sex of an organism.