Answer:
1.The trooper cars have flashing red lights on the top.
2.They're going to the store now for their supplies.
3.The chorus has its rehearsal on Tuesday nights.
6.Charles's poem was selected for publication in his school yearbook.
7.The five students' parents will be guests of honor.
8.Halen's car wouldn't start,so she never made it to the game.
9.Who's going to graduate dinner with you?
10.I've no idea who took your book.