This sounded pretty good, during the first segment I heard a slight background sound like a motor was running or a car was going by. Also during the end of every segment I heard a clicking sound as if you were stopping recording. Best thing to do for the end of any segment when done recording is listening to yourself and seeing if there is any background sound being picked up by the microphone such as the clicking sound at the end or maybe something else. If you pick up background sounds, might want to filter the sound for the microphone. If it is just a sound that happens before you start or stop talking then best thing to do is cut those parts out seeing as they are not meant to be part of the recording itself.
As for the recording itself, your voice sounds good but the one problem I have is that you remain monotone for almost the whole time and maybe raising your voice a bit every now and then. Could really use some practice as it seems you are doing. Another thing that helps is getting into character. Ask yourself what kind of voice the character would use since I highly doubt they would all use the same kind of voice used here.
Record yourself doing some higher and lower sounding voices and practice trying to sound a little different with your voice. The more variety you have with your voice, the better you will be in the voice acting business.
Overall, try getting more variety in your vocal chords, have fun voice acting!