“Please look on the biackboard."改错?

“Please look on the biackboard.改错? Please look at the pictures _____ the poster.(in,on) please look at the pictures on the wall中文意思. Please look at the picture on the wall.=Please ( )( )look at the picture on the wall.该如何转换? Please look ___the map of china on the wall. Kate ,please () (look) at these things on the sofa.Kate ,please() (look) at these things on the sofa.填啥子? look at the ( ),please look at the paper on the floor,please pick it up 还是 pick them up? 比如说please have -------look at the photo on the wall 要不要用a或an? please look ----- the blackboard.介词 look at the blackboard,please. 改错:Please look the blackboard. Please look the words改错 look the ducks,please改错 look!there is a sign No_____!on the wall.so please be quiet. can I do you what for at old this look wall the on clock please You have errors on the form.Please take a look and try Look,there‘s some paper on the ground,please pick （ ） up