Using the Past Participle
Choose
the correct verb form for each sentence:
- All magnetic fields are
(
create created) by a moving electric charge.*
- Scientists (base
based)
their theories on observations.
- By the 1950s,
scientists had (
observe observed) dozens of new kinds of particles
coming out of collisions of cosmic rays with nuclei.
- The transfer of photons
between (
charge charged) objects creates the electromagnetic force
that, among other things, holds electrons in their orbit.
- Venus is (
shroud
shrouded) by clouds, but has been (map mapped) by radar from orbit.
- Thousands of years ago
cataclysmic explosions (
rip ripped) through the cores of galaxies,
spewing huge jets of material hundreds of thousands of light-years into
space.
- The 1989 San Francisco
earthquake was just one of countless shocks (
trigger triggered) by
the inexorable movement of two tectonic plates.
- When molten rocks
(solidify
solidified), the grains are (lock locked) in, and
the rock "remembers" where the north pole was when the cooling (occur
occurred).
- All life is (
base
based) on the same genetic code.
- Genetics is the branch
of science (
devote devoted) to studying how traits are passed from
parents to their offspring.
- If you reflect on the
fact that everything chemical in your body is (
manufacture
manufactured), (move moved), (modify modified), and (use
used) by proteins that are (build built) from scratch from a
sequence of amino acids precisely (dictate dictated) by the DNA
sequence, you will see why we say that DNA holds the secret of life.
- Millions of Africans in
hundreds of lakeshore towns and villages are (
affect affected) by
the changing ecology of Lake Victoria.
- Now the lake's
shoreline is being (
strip stripped) of trees, resulting in soil
erosion and more lake (damage damaged).
- Humans, unlike other
species, have (
learn learned) to (shape shaped) and (alter altered)
their environment in remarkable ways.
- Science is a great
human adventure, with formidable challenges and priceless rewards, (
unimagine
unimagined) opportunities and (unparallel unparalleled)
responsibilities.
*Example sentences drawn from Science
Matters, Achieving Scientific Literacy, by Robert M. Hazen and James
Trefil. Anchor Books, 1991.
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