下列各句划线部分中有一处错误，请找出错误选项，并在横线上写出正确形式。
1.The boy spent three hours finish his homework.
A B C D ( ) ________
2. You’d better to work out this maths problem yourself.
A B C D ( ) __________
3. They have been marry for about 20 years.
A B C D ( ) _________
4. This old man had to make his living by sell newspapers.
A B C D ( ) _____
5. At the age of 90, my grandpa past way, in his sleep.
A B C D ( ) _____
1. C finishing 2. B work 3. C married 4. D selling 5. B passed