Grammar Quiz

While the astronauts ______ on the moon, they collected rock samples.

• walked

• were walking

• walk

The rocket ______ into space at exactly 9:00 AM yesterday.

• was launching

• launched

• launches

While scientists ______ the new data, they discovered a strange signal.

• analyzed

• analyze

• were analyzing

The satellite ______ Earth when it suddenly lost connection.

• orbited

• was orbiting

• orbits

As the spaceship ______ through space, the astronauts admired the view.

• was flying

• flew

• flies

The engineers ______ a new spacecraft while NASA prepared the mission.

• designed

• were designing

• designs

When the meteor ______ the moon, a cloud of dust appeared.

• was hitting

• hit

• hits

The astronaut ______ for years before his first space mission.

• was training

• trained

• trains

Neil Armstrong ______ onto the moon in 1969.

• was stepping

• stepped

• steps

While they ______ Mars, they found signs of frozen water.

• were exploring

• explored

• explore