He is writing a letter.

The baby is waving its hands and laughing.

He held a new book in his hand.

He waved his hand.

I started asking questions to explore his opinion.

He reviewed the manuscript and made corrections where necessary.

He is supporting the new project wholeheartedly.

Please keep this information in mind.

Before the game, the players shouted to fire themselves up.

Just as the phrase 'look before you leap' suggests, he prepared everything in advance.