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1. It’s rush hour. We’d better take the            if we don’t want to be late.
    a. gasoline     b. panel     c. convention     d. subway


2. Water is a(n)                  natural resource, but fossil fuels are not.
    a. conventional     b. renewable     c. farther     d. exhausting


3. We saw some precious                  of ancient creatures in the museum.
    a. fossils     b. subways     c. canes     d. sockets


4. The chemists are trying a new                  for the bug killer.
    a. panel     b. gasoline     c. formula     d. exhaustion


5.                 is a gas that burns very easily, so we must handle it carefully.
    a. Hydrogen     b. Convention     c. Exhaust     d. Choice

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