Bobby is my best friend.

He spent several years mastering the bowing technique of the violin.

I want to go to Bohol province in the Philippines.

We must start by filling the outer moat first.

The umpire declared a balk on the pitcher.

Mr. Zhai is my best friend.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He checked whether he remembered or not.

The ship sank into the sea.

My mother woke me up.