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41. Choose one of the options to fill in the gaps.

1. The method ___ is simple.

a) describes b) describe c) describing d) described

2. ___ the report at least a dozen times, he knew it almost by heart.

a) having read b) having been read c) read d) being read

3. ___ the results, Greg could take part in the conference.

a) having been obtained b) obtained c) having obtained

d) being obtained

4. ___ a lot of lectures, Alec failed the examination.

a) being missed b) missing c) missed d) having missed

5. The engineers examined the device ___ to establish the cause of the failure.

a) tried b) having been tried c) trying d) being tried

6. ___ of steel and glass, the house looks very modern.

a) being made b) having made c) make d) making

7. On the basis of the newly ___ data it will be necessary to update the report.

a) having processed b) processed c) processing d) being processed

8. The data ___ varied with the calculation method used.

a) being obtained b) obtaining c) obtained d) having obtained

9. Problems ___ university graduates need some counseling.

a) being faced b) faced c) having faced d) facing

10. ___ our work, we went home.

a) having finished b) finished c) having been finished

d) being finished

11. The cars ___ now at our works are very good.

a) being produced b) having been produced c) producing

d) having produced

12. ___ two centuries ago, the house has no lift.

a) having built b) building c) build d) having been built

13. ___ about the new design, he said that it had solved many problems.

a) speaking b) spoken c) having been spoken d) being spoken

14. ___ this problem, we decided to change the design.

a) considered b) having been considered c) being considered

d) having considered

15. A lot of ideas are feeding back from the ___ sciences into the pure science.

a) applied b) having applied c) being applied d) applying

16. The aim of the research is to work out a system ___ high level purification from carbon oxides.

a) guaranteed b) guaranteeing c) having guaranteed

d) guarantees

42. Choose one of the options to fill in the gaps.

1. ___ the necessary results, we stopped our experimental work.

a) having obtained b) having been obtained c) being obtained

d) obtained

2. ___ the programme, he found some errors.

a) debugging b) having debugging c) having been debugged

d) being debugged

3. ___, the device began working much better.

a) repairing b) having repaired c) having been repaired

d) being repaired

4. The ___ composites do not meet modern requirements.

a) existed b) being existed c) having existed d) existing

5. ___ cobalt to electrode materials we can increase their catalytic characteristics.

a) adding b) having added c) added d) being added

6. The persons ___ a committee are required to submit several documents to the Board.

a) having formed b) forming c) being formed d) formed

7. Industries ___ steel and chemicals require very large quantities of raw materials.

a) having produced b) produced c) producing d) being produced

8. A country ___ to limit its population may discourage immigration and encourage emigration.

a) being wished b) having wished c) wished d) wishing

9. With his experience ___, he became wiser.

a) grown b) being grown c) grows d) growing

10. This problem can be solved by creating a metal layer with the ___ characteristics.

a) controlling b) having controlled c) being controlled d) controlled

11. All preparations ___, the installation was put into operation.

a) having made b) being made c) making d) made

12. Chromium ___, the strength and hardness of steel increases.

a) having added b) adding c) added d) been added

13. The article deals with microwaves, particular attention ___ to radio location.

a) paid b) having paid c) paying d) being paid

14. A body can move uniformly and in a straight line, there ___ no cause to change that motion.

a) having been b) been c) being d) had been

15. ___ the possible relationship between capacity and expected output, we now examine the output changes.

a) having been explored b) being explored c) having explored

d) explored

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