Here are the correct answers to the questions you provided:
She has been playing the piano since she was 13. (d)
Hurry up! it's 10 o'clock. The bus leaves at 10.15. (a)
More and more students are choosing online classes today. (b)
My sister is always taking my tablet without asking! (c)
I can't find my phone. Has anybody seen it? (b)
I believe you should take this chance to travel abroad. (a)
Why are your clothes dirty? - I have been fixing the car all day. (c)
How long have you known Garry? (b)
Feel free to ask if you need help with more questions!