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1. (speak) about the future of coal, it is necessary to note the production of liquid fuels such as gas and oil from coal.
2. (explain) that the formula (give) here is correct, it is necessary to study them first.
3. Some types of motors are not suitable for braking duty and the requirement must be specified at the time of (order).
4. Recommendations from physicists will allow the necessary measures (take) to protect the air from pollution.
5. Certain porous solids have a great capacity for (absorb) gases.
6. (gain) maximum benefits modem industrial engineering must be capable of (assist) in and (perform) many services.
7. (find) out the state of a mass of a gas one should know its volume, its pressure and its temperature.
8. The critical point is that point on the course, which under (exist) conditions is equally distant from the point of departure and desired destination.
9. In order to make calculations of power when (use) alternating current, some definite current and voltage values must be chosen.
10.In order (increase) the rate of capital accumulation, resources will have to be transferred from the production of consumer goods to the production of capital goods.
1 l.The trouble was due to the fact that the engine was put into operation without (test) it beforehand.
12. The conveyor (design) will be installed at a coal-preparation plant.
13. Economic growth makes it possible to devote more resources to the social services without (have) to cut private consumption.
14. When there are no forces (pull) or (push) a body that body must always be in equilibrium.
15. The individual forces (act) on an airplane in flight are generally replaced by the resultant force.
16. Such information often takes a long time to become available in processed form, and often it is too late (use) in current analysis.
17. Most castings cannot be employed as parts of complex mechanisms without (machining) and (finish).