Immediately after the last bell chimed, the students hastily left the classroom for summer vacation.

Hardly had the students heard the last bell when they promptly commenced packing for their summer vacation.

The students wasted no time in the classroom once the last bell heralded the beginning of summer vacation.

Following the toll of the final bell, the students eagerly assembled outside the classroom to plan for summer vacation.

No sooner had the final bell sounded than the students dashed out of the classroom to enjoy their summer vacation.