have a look on the cake对吗?要把on改成at吗?

have a look on the cake对吗?要把on改成at吗? 比如说please have -------look at the photo on the wall 要不要用a或an have a look at the clothes on sale同义句 （ ）（ ）the clothes on s ( ),your cake is on the des.是用look at 还是用look Look at the c()on the cake.The boy is 14 years old now I will have a look at the time-table for you on the Internet May I have a look at the book on the right? Let's go and have a look at the n on the blackboard.根据首字母填空 can i have a look ( )the radio?A,at B,in C,on Have a look at the clothes on sale的同义句 I----like to have a look at your photos on the great wall.As Have a look at the clothes on sale.(改为同义句）