小题1:It’s necessary for each student to hand in homework on time.
小题2:Do you know how many years /how long they have been friends?
小题3:The HN virus is so terrible that it may make many people lose their lives.
小题4:Yangzhou is an old cultural city which has / with a history of more thanyears.
小题5:In ancient times, Yangzhou was famous for its beauty in the world.