Finally I told my manager that I couldn't help him on the tender he passed to me. What I wanna mention here is I couldn't believe I did it. Actually I wanted say out few days ago, but every time just failed to do so. Since I'm the new staff there, I shouldn't reject the work they passed to me. The problem is my manager doesn't know what is my main job function. Doing tender only to show I give them a hand, it's not my main duty. My boss always complains that I stuck in the tender until I didn't do my work on time. Since I wish to show my good performance and have a good annual bonus, I know I shouldn't let this situation continues. Ha, luckily my boss is on my side. :p