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1.There is a book ... the shelf. 2/There are some flowers ... the vase.3.There is a ball ... the table.4.There were some chairs ... the black-board.5.The armchair is ... the TV set.6.There is a fridge ... the stove and the sink.7.The letters are often written ... him ... a pencil.8.The holidays will begin ... a week.9.Sometimes lectures are not attended ... him.10.I am walking ... the street.11.I go ... the college every day.12.The people are walking ... the smog.13.The girl is walking ... the road.14.We are coming ... the room.15. ... that moment he saw her.16.The text was being translated ... the lesson.17.He was born ... the 5 of March.18.There are many flowers ... the window sill.19.There is a shop ... the college.20.There is a lamp ... the table.