Ex. 8 Fill in the blanks with prepositions where ncccssary. of, to, with, for, in, by, in terms of
I. If an idea explains or correlates a number ... facts, wc call it a
hypothesis. 2 Scientists subject the idea ... experimental checking. 3 If
the hypothesis agrees ... the results ... experiment, wc call i t ... a theory
or ... a law. 4 ... example, everybody knows the periodic law. 5 The
explanation... the fact is ... the atomic theory. 6...crystals the atoms arc ... a regular order. 7...the atomic thcoiy wc mean that substanccs consist
... atoms. 8 Scientists explain facts ... atoms and their structure.

I тип условно- придаточных предложений:

1. If I do my homework I'll go for a walk with my friends.

2. If she doesn't cook dinner, her children will be hungry.

3. When they write the dictation they will have a rest.

4. If I finish my school year excellently my parents will give me a present.

5. If the sun shines he will not take the umbrella.

II тип условно- придаточных предложений:

1. If I didn't read this book my techer would give me a bad mark.

2. If he came to see me I would show him my collection of coins.

3. If they came in time they would not miss the train.

4. If the weather was fine I would go to the beach.

5. If I were you I wouldn't do that.

This girl..is. my sister. Tom .is.. in bed. Ann.is.. ready. The pupil.is..very clever. The duck..is. yellow. Here it ..is.. . It..is. a long pencil. I..am. here. I.am.. at home. I..am eight. .We are.. pupils. My sisters.are.. pupils. I .am...tired. Olya and i..are. tired. The girls..are..tired. The houses .are..old. Itisa long pencil. I am... here. I .ameight. We are.. at school. My sister and I are pupils. My sisters ...are... pupils. I ...am tired.Olya and I ...aretired. My sister and i.are tired.