Practice Quiz Mode
Take all 5 MCQs in interactive quiz mode with timer and progress tracking
Professional American football player Fred Cox invented one of the world's most popular toys. In the 1970s, he came up with the idea for the Nerf football, which ________ of the harder and heavier regulation football.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A:
were a smaller, foam version
B:
are smaller, foam versions
C:
were smaller, foam versions
D:
is a smaller, foam version
Formed in 1967 to foster political and economic stability within the Asia-Pacific region, the Association of Southeast Asian Nations was originally made up of five members: Thailand, the Philippines, Singapore, Malaysia, and Indonesia. By the end of the 1990s, the organization ________ its initial membership.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
has doubled
B:
had doubled
C:
doubles
D:
will double
Atoms in a synchrotron, a type of circular particle accelerator, travel faster and faster until they ________ a desired energy level, at which point they are diverted to collide with a target, smashing the atoms.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
will reach
B:
reach
C:
had reached
D:
are reaching
Led by Syrian American astronomer Shadia Habbal, the Solar Wind Sherpas are an intrepid team of scientists who travel the globe to study solar winds, the streams of particles emanating from the Sun that are only visible from certain locations during a total solar eclipse. When such an eclipse is imminent, the Sherpas pack up their telescopes and ________ ready.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
get
B:
had gotten
C:
got
D:
were getting
Emperor penguins don't waddle out of the ocean. They launch themselves at such a high speed that they travel up to two meters before landing. How ________ A layer of microbubbles on their plumage reduces friction as the penguins speed to the surface.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
they are able to move so fast!
B:
are they able to move so fast.
C:
they are able to move so fast.
D:
are they able to move so fast?
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