Turn the following sentences into reported speech.
1. ''China is a densely populated country'', the teacher said to us.
2.''I'll help you to repair your car tomorrow'', she said to me.
3.''I’m going to Spain next week'', he said.
4.''I’ve applied for several jobs this week'', he said.
5.''How much does this car cost?'' Pamela asked.
6.''Do you play any sports?'' Mr.Roberts asked.
7.''Where did i put my car keys?'' Daniel wondered.
8.''Let's go to the shopping center'', Sarah suggested.
9.''You should go to the doctor'', mother advised.
10.''Why don't you take a taxi?'' Mike recommended.