Question

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She is already seven years old . She cannot eat on her own (though/since)
You cannot go out to play . You must clean your study(unless/because)
Ria was on an official trip . Her house was burgled (when /unless)
Mr. Sharma is very old . He practised martial arts daily(unless/thought)

Answer 1

1 she is already seven old though she cannot eat on her own
2 you cannot go out to play because you must clean your study
3riya was in a official trip when
4 Mr sharma very old thought

Answer 2

Hey dear!!

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1. She is already seven years old. She cannot eat on her own. (though/since)
Ans: Though she is seven years old, she cannot eat on her own. 

2. You cannot go out to play. You must clean your study. (unless/because) 
Ans: You cannot go out to play unless you clean your study. 

3.Riya was on an official trip. Her house was burgled. (when/unless)
Ans: When Ria was on an official trip, her house was burgled. 

I think the 4th question has a bit of correction to be made... So, I am providing you the corrected statement's answer:

4. Mr.Sharma is very old. He practises martial arts daily.
Ans: Though Mr.Sharma is very old, he practises martial arts daily.

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Hope helped!!