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Look! Now we have a big house. We have four bedrooms, a dining room, a living room and a kitchen. Ally and I have our own rooms.
- The house is really big! (1) _Did you buy __ (you buy) any new furniture?
- Yes, our parents (2) have already bought___ (already buy) this beautiful dining table. Today we will have dinner together here and mum (3)_have already sewn__ (already sew) new curtains.
Oh, the room is really beautiful. Can you show me my room?
- Of course, we can. It is next to my room. Mum (4)_has just redecorated__ (just redecorate) it
- (5) _Has she put__ (she put) a new carpet on the floor? 
- Yes, she has. And she (6) __has made_ (make) this lamp.
-It is very cosy here.
(7) __Have you seen_ (you see) the flowers in the garden?
- Yes, I have. (8) _Did you help__ (you help) your Dad with the flowers?
- Yes, I do. I always help him in the garden. We (9) _planted__ (plant) these flowers together.
- Good girl !

 1. Dmitri Mendeleev developed the concept of the periodic repetition of properties.
2. There are 8 columns in the periodic table. In each column, elements are arranged by the same properties, such as the same orbital arrangement of electrons.
3. Mendeleev predicted properties of yet undiscovered (missing) elements and left empty spaces for them in the table.
4. There are natural groupings between the elements that are closely related to each other.
5. In order to understand better these natural groupings, chemists have tried to fit the elements into a single plan.
6. John Ncwlands made one of the first attempts to fit the relationships among the elements by suggesting the Law of Octaves.