We __________ the rocket launch if our bus had arrived earlier.
could have watch
could watch
had watched
could have watched
We would have watched the meteor shower if the sky __________ cloudy.
had not been
has not been
would not be
was not
We might see more stars if the city __________ fewer lights.
had had
had
has
would have
If our team had finished the robot, it __________ the school competition.
might win
had won
might have win
might have won
If scientists had found liquid water, they __________ more experiments.
would plan
had planned
would have planned
would have plan
The students could have seen Mars if they __________ the telescope correctly.
would adjust
adjusted
had adjusted
have adjusted
If the rover had taken clearer pictures, scientists __________ the crater better.
could have studied
could study
could have study
studied
If our school had a powerful telescope, we __________ Saturn’s rings clearly.
can observe
could observed
could observe
would observing
I __________ nervous if I traveled alone through space.
will feel
had felt
would felt
would feel
Sara could become an astronomer if she __________ science regularly.
studies
would study
had studied
studied
Leo would join the astronomy club if it __________ after class.
would meet
met
had met
meets
If Leo had charged his camera, he __________ amazing pictures of Jupiter.
had taken
would have taken
would take
would have took
If our class built a rocket, we __________ it after our teacher.
named
had named
might named
might name
If aliens visited our school, the students __________ many questions.
would asked
asked
have asked
would ask
Maya __________ the space exhibition if she had known about it.
would have visited
had visited
would have visit
would visit
The mission might have succeeded if the computer __________ during landing.
had not failed
did not fail
would not fail
has not failed
If we lived on Mars, we __________ special suits outside.
needed
would needed
will need
would need
If Maya were an astronaut, she __________ photos from the Moon.
would take
had taken
would took
will take
If the astronaut had brought more batteries, the equipment __________ longer.
would have work
would have worked
would work
had worked
If my best friend discovered a planet, I __________ extremely proud.
would feel
had felt
would felt
felt