1) how long did your exam last?
 a)Yes. it is my last exam.
 b) It lasted three hours.
 c)It lasts three hours.
 d)It will last three hours.
2)What were you doing when the doorbell rang?
 a)I was feeding the dog.
 b)I fed the dog.
 c)I feeded the dog.
 d)I am feeding the dog.
3) Did you know who broke my skateboard?
 a)It is not me.
 b)It is not .
 c)No. thanks.
 d)it was not me.
4) When did he go home?
 a)Two hours ago.
 b)In two hour is.
 c)In two hour is time.
 d)For two hours.