III. I, , .
1. Having xome home he began to read the book.
2. I know of having been asked to do this work.
3. hey may be produced by burning coal, gas or any other fue1.
4. hey succeded in producing a new salt.
5. The design of the electrode was then beling investigated in our laboratory.
IV. ,
it, that, one:
1. By substituting various groups into a molecule it is possible to add hydrogen to different parts
of a molecule in the industrial hydrogenation processes.
2. he properties of a substance determine its value but it is the properties and conditions which
determine its use.
3. Red phosphorus is less chemically active than the yellow on.
4. It was in 1898 that the Curies obtained the new element radium whose radioactivity was several
million times stronger than that of uranium.
V. , , (. II):
1. We (had studied, studied, were been studied) the properties of this material before we began to use it.
2. This preparation (was found, was finding, has found) wide use in the treatment of pneumonia in children.
3. fter neutralizing carbohydrates with caustic soda reducing sugars (have been produced, are produ-
cing, produce).
4. It is well known that the institute (has concentrated, is concentrating, concentrated) on seeking new
medicinal herbs.
. (. III)
1. The process to convert substances into other substances is very important.
2. There are many reasons to study chemistry.
3. get salts you have to know some methods of preparing salts.
4. It is possible to get a good knowledge of chemistry by learning theoretical chemistry and carrying
out practical work.
4
4, :
1. - .
2. : rticiple I, II; Gerund; Infinitive.
3. : Indefinite, Perfect, Continuous (tive and Passive Voi).
. , . - :
I ( .)
1. addition, 2. naturally, 3. different, 4. advisable, 5. weaken, 6. famous, 7. turbidity, 8. container.
: 1, 7, 8.
: 3, 4, 6.
|
|
|
: 5.
: 2
2 ( . III)
1. The Pharmacopoeia is a book -- , containing a list of medicinal substances - with description, tests and formulas for , preparing them. .
containing Participle I,
2. The Pharmacopoeia describes also
the proper method of packaging and .
storing the drug.
packaging, storingGerund, .
3 ( . IV)
1. When heated they give off a mixture , of gases and vapours of volatile oil. .
heated Participle II,
2. The substance tested showed -
interesting properties. .
tested ticiple II,
showed - st Indefinit tive.
