连忙 (lián máng): ngay lập tức

When I heard the doorbell ring, I promptly put down the book in my hand and went to answer the door.

Seeing the teacher walk into the classroom, the students promptly returned to their seats and sat properly.

He accidentally knocked over the water cup and promptly apologized to the classmate next to him.

Discovering her wallet was missing, she promptly went back along the path she had just taken to look for it.

Hearing someone shout for help, he promptly ran over to see what had happened.