Điền a hoặc an vào chỗ trống thích hợp

write a / an or the 
1 . He is ................ robot designer
2. In the future , we will live on ............ Moon . 
3. I have .............. old toy robot . 
4. ................ car over there is mine . 
5 . ........... Earth goes around .................. Sun .
mn help tui !