1.Why is Lana trying to cheer up her friends?
或：Why is Lana trying to cheer her friends up?
2.It took the volunteers several hours to finish the plan.
3.What if the boss agrees to put off the meeting?
或：What if the boss agrees to put the meeting off?
4.Would you like to take turns to sing in public?
5.Your donation made it possible for me to study at school again.
6.My aunt puts her love to a good use by working in hospital.