Verified Answer :

  1. (It was an example)
    2.Did you know John is planning to call a meeting?
    3.Do you know if theyve ever had  hit a single before?
    4.I want to know when your leaving (can
    t use a question mark for this one)
    5.I doubt he told the truth (cant use a question mark  here)
    6.Could you tell me where the nearest swimming pool is?
    7.She wondered who left that message on the answerphone (cant use a question mark)
    8.He wanted to know what time they were due to arrive (cant use a question mark here) 

    Hope this helps :)