Change into Indirect speech. 

Q:

The teacher said to the boys. "Wait here till I return."

• 1
  The teacher told the boys to wait there till he returned.
• 2
  The teacher told the boys that they should wait till her returns.
• 3
  The teacher advised the boys not to wait for him till he returns.
• 4
  The teacher requested the boys to wait for him till he returned.