Ex. 8. Fill in the blanks with prepositions where ncccssary.
by, of, to, in, after, without, between
1. D. I. Mendeleyev made ... a thorough study ... the relation ... the
atomic weights... the elements and their properties. 2. Mendeleyev’s periodic
table consisted ... seventeen columns. 3 a general way Mendeleyev’s
table resembled ... the present periodic table ... the noble gases.
4. Mendeleyev placcd... a number... elements... different positions. 5. The
periodic law was accepted ... its proposal... Mendeleyev. 6. M ost... the
elements occur ... the periodic table ... the order ... increasing atomic
weights. 7. Mendeleyev predicted the existence ... six elements
corresponding... vacant places... his table. 8. The properties... the newly
discovered elements were very close ... the properties predicted ... him.

1. I am glad (to be introduced) to you. 2. The box was (to  be handled) with care. You should (ask) someone (to help) you. This might not (have happened). 3. Her mood seems (to have changed) for the worse. We had better not (speak) to her now. 4. I am sorry (to have disappointed) you but I did not mean anything of the kind. 5. He is happy (to have been awarded) the first Landscape Prize for his picture. 6. He was anxious (to take) the first place in the figure-skating competition. 7. The poem can easily (be memorized). 8. This poem is easy (to memorize). 9. I did not expect (to be asked) this question. 10. There were so many things (to do), so many experiments (to try). 11. The teacher expected him (to give) a better answer at the examination. 12. They are supposed (to have benn experimenting) in this field for about a year and are believed (to have achieved) good results. 13. He must (have read) something funny; he is smiling all the time

Dear Alex,
Thanks for your last letter. I'm sorry I haven't answered earlier but I was really busy with my school. As you know my native county is Russia. My home city is Moscow. Moscow is the heart of our country. People in my city are helpful and friendly. There are a lot of places of interest in Moscow. It is a very modern and civilized city. There are also many cars , tall buildings, shopping centeres in Moscow. My town is very beautiful and it is comfortable to live here. I invite you to visit my home town ! I am sure , you will get unforgettable impressions! Alex,and what about you ? Write me about your town (city ). I've got to go now because my dad asked me to help him in the garage.
Write back soon!
Best wishes,
Mark