Времена английского глагола

Времена английского глагола
Времена английского глагола
Упражнение 8. Выберите требуемую по смыслу
форму из предложенных в скобках и объясните свой
выбор.
Упражнение 8. Выберите требуемую по смыслу
форму из предложенных в скобках и объясните свой
выбор.
Armageddon Unlikely
Armageddon Unlikely
The universe may be a safer place for planet Earth
than astronomers ___________ (thought/ have
thought/had thought). A new survey ____________ (has
found/found/ has been found) that there are far fewer
dangerous asteroids hurtling through space that
______________ (can/could) hit Earth and cause
widespread devastation.
Previously,
astronomers
_________________
(estimated/have estimated/had estimated) that there were
between 1,000 and 2,000 asteroids at least a kilometer in
diameter that ___________________ (can/ could)
potentially slam into our planet. That meant there was
a 1 percent chance of a catastrophic collision with Earth
in the next million years. Based on the findings,
researchers from Yale University and the Jet Propulsion
Laboratory in California ____________________
(calculated/had calculated/have calculated) that the total
number of potentially devastating asteroids is about half
the earlier estimates - about 700.
The universe may be a safer place for planet Earth
than astronomers ___________ (thought/ have
thought/had thought). A new survey ____________ (has
found/found/ has been found) that there are far fewer
dangerous asteroids hurtling through space that
______________ (can/could) hit Earth and cause
widespread devastation.
Previously,
astronomers
_________________
(estimated/have estimated/had estimated) that there were
between 1,000 and 2,000 asteroids at least a kilometer in
diameter that ___________________ (can/ could)
potentially slam into our planet. That meant there was
a 1 percent chance of a catastrophic collision with Earth
in the next million years. Based on the findings,
researchers from Yale University and the Jet Propulsion
Laboratory in California ____________________
(calculated/had calculated/have calculated) that the total
number of potentially devastating asteroids is about half
the earlier estimates - about 700.