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4. He didn’t expect them … here.
A.
to study
C. to have been studied
B. to be studied
D. study
5. The teacher made the students … the metal properties.
A. to study
C. to have been studied
B. to be studied
D. study
6. The teacher let the students … the experiment.
A. to change
C. to be changed
B. change
D. to have been changed
7. The teacher supposed the students… the
text about engineering ma-
terials.
A. to be read
C. to have been read
B. read
D. to have read
8. He ordered the experiment … by them.
A.
to be made
C. to have made
B. make
D. to make
9. We expect them … this problem long ago.
A. to have investigated
C. to be investigated
B. investigate
D. to investigate
10. He believes the manufacturers … the technological process.
A. to have been changed
C. change
B. to change
D. to be changed
3. The text contains different mistakes: 2 — in spelling, 5 — in grammar. Cor-
rect the mistakes and rewrite the text.
There are various clases of materials. They can be divide into two groups:
metals and non-metals. Metals includes ferrous and non-ferrous metals. Cast
iron and steel is common ferrous metals. Copper and aluminium is non-fer-
rous metals. Non-metals embraces polimers, ceramics, etc.
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