IV. Read and translate the text. Fill in the gaps with the correct prepositions.
A
Bunsen burner is a device used (in
/ on) scientific
laboratories for heating, sterilization, and many other uses. It
safely burns a continuous stream (of
/ from)
a flammable gas such as natural gas (which is principally methane) or
a liquified petroleum gas such as propane, butane, or a mixture of
both.
The
Bunsen burner is used frequently in the laboratory as a source of
heat. This burner is designed so that gaseous fuel may be mixed (with
/ of)
the correct amount of air to yield the maximum amount of heat. In
order (to
/ with)
use this burner properly and safely, it is essential that you
understand its construction and the adjustments that can be made.
The three principal parts of the burner are: barrel, needle valve, and base. The quantity of gas admitted to the burner is controlled (by / of) the needle valve, while the air needed for combustion is admitted (at / with) the small opening around the bottom of the barrel. The air is controlled by turning the barrel so as to make the air holes larger or smaller.
Always open the desk outlet valve fully and regulate the gas supply to the burner by the needle valve. Always extinguish your burner by turning (off / on) the desk outlet valve (and then closing the needle valve and barrel.) If there is an accident always shut off the desk outlet valve immediately. Always light the burner (in / on) open space (on / from) lab counter. After you have adjusted it for the flame needed move it (into / for) position. One person (in / at) lab group is always responsible (for / by) maintaining the burner and flame.
IV. Grammar Exercise
Future Indefinite Passive
Affirmative |
S + shall / will + be + V-ed (III). Wax carvers will be used for precise work by dental technicians next week. Computer-aided milling equipment will be used by some dental technicians. I shall be given some instructions how to use a Bunsen burner. |
Interrogative |
shall / will + S + be + V-ed (III)? Will dust and fumes be vacuumed and exfiltrated in an hour? Will dental technician's workbench be equipped with only a few hand tools? |
Negative |
S + will not (won’t) / shall not (shan’t) + be + V-ed (III). Dental lab technicians will not (won’t) be provided with specialized training. We shall not (shan’t) be told about available dental lab equipment. |
I. Change the following sentences into Passive Voice.
The teacher will explain to us how to use the dental oven.
Dental technicians will use picks for scribing, positioning, probing, etc.
Ergonomic shapes of wax carvers will give users the ability to get into tight places.
The university will supply our dental laboratory with all necessary equipment and tools.
Denturists will polish and grind all kinds of metals in dental laboratories next week.
To melt and mix agar I will use a duplicating machine.
In a few months many laboratories will switch over to electric hot plates.
Each stainless steel piece will feature single cuts.
Laboratory production of dentures will produce lots of dust.
Denture manufacturing will involve high amount of work.