Ex1:

Sources of energy                Advantage(s)                                           Disadvantage(s)

water/hydro                    clean,safe,abundant                                      expensive

solar                         renewable, abundant, clean,safe                expensive, difficult to restore

biogas                      renewable, abundant, safe, clean                   polluting, difficult to use

nuclear                           renewable, clean                                    expensive, dangerous

coal/oil/natural gas        cheap, abundant                                 non-renewable, polluting

Ex3:

1. solar / safe

2. non-renewable

3. wind / clean

4. dangerous / expensive

Ex4:

0oo: plentiful, limited, easily, energy

o0o: abundant, convenient, enormous

Ex5:

1. a'nother / re'newable

2. con'venient / 'abundant

3. 'limited / en'vironment

4. 'plentiful / 'easily

5. ex'pensive / 'dangerous

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-haihan-