Are these sentence correct?

Mobile phone which was stealed yesterday is whose?
手机昨天被偷走的了手机是谁的?
How can find a cheap renthouse?
怎么才能找着便宜的出租房租?
Would you please take off your hat?
请你摘下了你的帽子吗?
If you want to improve, what should you do?
也许如果你想提高, 你应该做要作什么?
Have you ever climb a long path on mountain?
你曾经在山上爬过很长一段路吗？以前坐过长途爬山吗?
Have you ever had a hard goodbye?
你以前曾经有过一难过的告别吗?
Who was called by broadcast?
广播里在点名谁的名?
You decided how to go from Tehran to Mashhad ?
从Tehran到Mashhad你选择怎么作走?
After the train started to move what can you do?
火车开了以后你可以作做什么?
Looking outside window in train, what did you see?
在火车看看火车的窗外，你看到了什么?

Just for your reference :D  and Any Qs, let me know.