He smiled triumphantly.

His strong point is mathematics.

He went to school by crossing the bridge.

Wataru is good at crossing rivers.

Wataru is my best friend.

He crossed the river to go to school.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

We always take into account the needs of our regular customers.