l. There are few students in the classroom.(改为反意疑问句)
   There are few students m the classroom, ______?
2. Our school held a sports meeting last week.(改为一般疑问句)
   ______ your school______a sports meetng  last week?
3.You mustn't cross the road when the traffic lights are red. (改为祈使句)
   ______ the road when the traffic lights are red.    .
4.I came here three days ago. (用for three days改写)
   _____________________________________________________