1.Tom's twin brother Sam.
2.Because of Julie's beautiful pictures.
3.He told Tom to feed his dog,water his flower,send a thank-you email to his pen pal called Julie .
4.No,because he didn't have Sam's code.
虽然我帮你做了,但是以后还是得自己做,别老是网上找答案,这样对自己的英语学习没好处的.乖点o(∩_∩)o