I can`t afford to get married, what should I do to curb my sexual drives?
                                You should offer a lot of voluntary fasting, keep busy with useful and permissible acts and make supplication to Allah, The Exalted.
                             
                        
                            
                                
                                1- A young man whose father and grandfather are dead. Unfortuntly, he passedaway leaving a mother, two sisters and a brother. Do his paternal uncles inherit him? 2- A man died leaving daughters, a wife, brothers, a mother or no mother. It is well known that the daughters inherit two thirds and the wife one eighth. To whom does the rest of the estate go and what is the evidence on that from the texts of Sharia?
                                
All perfect praise be to Allah, the Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallahu ‘alayhi wa sallam, is His slave and Messenger.
1- The full brother or the paternal half-sibling disinherits the paternal uncles. The paternal half-sibling takes one sixth and because they are from the Asabah (Male relatives on the father`s side) of the deceased they take the rest of the estate. The proof of this is that Ibn ‘Abbas (May Allah Be Pleased with them) reported God’s Messenger (PBUH) as saying: "Give the shares to those who are entitled to them, and what remains over goes to the nearest male heir." [Agreed upon]. In this case, nothing is left to them.
2- The brothers take the rest of the deceased`s estate and the full brother disinherits the paternal half-sibling, and the proof of this is the aforementioned narration. And Allah The Almighty Knows Best.
 
                             
                        
                            
                                
                                What is the ruling on someone who perform their prayer after finishing it because they believe they missed a Rak'a, a prostration, or that they did not perform it correctly (thinking their prayer was invalid)?
                                If he was sure that his prayer is void then reperforming it is an obligation along with figuring out the reason of invalidity so long as this wasn't out of uncertainty. And Allah Knows Best. 
                             
                        
                            
                                
                                What is the ruling on performing voluntary prayers during official working hours?
                                All perfect praise be to Allah, The Lord of The Worlds, and may His Peace and Blessings be upon our Prophet Muhammad and upon all of his family and companions
There is no harm if  there was break time during official working hours, but if not then it is impermissible. And Allah Knows Best.