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A. Read the following text.
Did you know that the things nobody needs can be used to produce
electricity, heat or fuel? Changing waste to energy can be considered
one of the most helpful ways to save the resources of the earth. Because
garbage can be changed directly into a liquid fuel, it can be used in cars,
trucks, buses and airplanes. To do that, garbage should be collected and
taken to a landfill by workers. People may be paid for voluntary garbage
delivery as well. It is important to know that not all types of waste can
be used to produce fuel. Some materials may give off harmful gases in
the process. Therefore, people should be informed of this danger and
warned about the possible harms.
B. Read the following example sentences.
The principal should call the The parents should be called (by
parents. the principal).
The cook may make a fish A fish salad may be made for
3 salad for dinner. dinner (by the cook).
LESSON People must obey the traffic The traffic rules must be obeyed
rules. (by everyone).
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