may i ask that the tasks approved by manual or by automatic

I think they are doing it manually that is why they are taking it long for you to be approved. When it say abandoned it simply means that you've accepted the job but have returned it back for some reason or you have not finished the task on time. if you will look at the task it is time bound meaning if the time usually given at 8 hours to 24 hours has lapsed that is already considered as abandoned tasks.

A few days ago I finished four logo tasks and three of them were approved. I think they were approved by manual. Otherwise it won't take so long time. Besides, they have to check whether my logos are qualified or not. So they can't do it automatically. I love China