Pick the correct verb to agree with the subject. If the subject is singular, pick the singular verb.
If the subject is plural, use the plural form of the verb.
Click to start the clock.
His brother _ an astronomer./0/is,are
The engineer and the astronomer _ meeting today./1/is,are
The conference speaker _ an astronaut./0/is,are
The astronauts _ living at the Space Station./1/is,are
Jeff Williams, an astronomer, _ American./0/is,are
Julie Payette and Robert Thirsk _ Canadian./1/is,are
The flight director _ in charge of the mission./0/is,are
Marsha Ivins and Koichi Wakata _ astronauts./1/is,are
The discovery of water on Mars _ exciting./0/is,are
Mars and Venus _ the closest planets to Earth./1/is,are
Callisto _ one of Jupiter's moon./0/is,are
Callisto and Ganymede _ two of Jupiter's moons./1/is,are
A flag _ painted on the rocket./0/is,are
Many flags _ painted on the rocket./1/is,are
Mars _ a very thin atmosphere./0/has,have
Jupiter and Saturn _ dense atmospheres./1/has,have
Each student _ a computer./0/has,have
All students _ computers and telescopes./1/has,have
Tim _ going to the star party./0/is,are
Rob's friends _ going to the star party./1/is,are
My uncle _ always loved astronomy./0/has,have
Most people _ never looked through a telescope./1/has,have
Someone from the group _ missing./0/is,are
The astronomy books _ missing from the library./1/is,are
Earth _ denser than Saturn./0/is,are
All the other planets _ denser than Saturn./1/is,are
The book on astronomy _ very informative./0/is,are
There _ many astronomy books in the library./1/is,are
Raj _ able to work the telescope./0/is,are
The students _ not ready for the test./1/is,are
Your order for a solar filter _ ready for pickup./0/is,are
Your solar filters _ ready for pickup./1/is,are
The space station _ visible tonight./0/is,are
The space station and the shuttle _ visible tonight./1/is,are
Jupiter _ the largest planet in the solar system./0/is,are
All the other planets _ smaller than Jupiter./1/is,are
Earth _ only one moon revolving around it./0/has,have
Jupiter and Saturn _ more than one moon./1/has,have
The Solar System _ planets, moons, and stars./0/has,have
Jupiter and Saturn _ many moons./1/has,have
Saturn _ several hundred rings./0/has,have
Jupiter, Uranus, and Neptune _ rings./1/has,have
Our solar system _ billions of stars./0/has,have
Many stars _ systems of planets and moons./1/has,have
The sun _ sunspots that come and go./0/has,have
We _ tides because of the moon's gravity./1/has,have
Mars _ higher mountains than any other planet./0/has,have
Most planets _ an atmosphere./1/has,have
An asteroid _ a large rock in outer space./0/is,are
Comets _ made of dust and ice./1/is,are
Air _ thinner as you get further from Earth./0/is,are
There _ eight planets in our solar system./1/is,are
Our solar system _ one star - the sun./0/has,have
Comets _ a wide range of orbital periods./1/has,have
Saturn's moon, Rhea, _ oxygen in its atmosphere./0/has,have
Comets _ an elliptical orbit./1/has,have
Pluto _ a dwarf planet./0/is,are
Which planets _ visible tonight?/1/is,are
Saturn _ made up of gases./0/is,are
Earth, Mars, Venus and Mercury _ made of rock./1/is,are
Most of the universe _ empty space./0/is,are
Meteors _ bits of dust or rocks from space./1/is,are
Gravity _ a force pulling matter together./0/is,are
Comets _ like dirty snowballs of ice and dust./1/is,are
When _ the best time to watch a meteor shower?/0/is,are
Asteroids _ often called minor planets./1/is,are
Of the planets, Mars _ a climate most like Earth./0/has,have
Some large asteroids _ moons./1/has,have
Dave _ a new star atlas./0/has,have
The astronomy club members _ a meeting tonight./1/has,have
Dr. Li _ a degree in astronomy./0/has,have
The astronomers _ a star party on Monday night./1/has,have
Ely _ a member of the astronomy club./0/is,are
Jupiter _ sixteen major moons./0/has,have
Mercury and Venus _ no moons./1/has,have
An astronomer _ the stars./0/studies,study
Astronomers _ the stars./1/studies,study
He _ the moons around Jupiter./0/watches,watch
They _ through the telescope./1/watches,watch
He _ to the larger telescope for a better view./0/switches,switch
They _ places so that both have a chance to see the planet./1/switches,switch
The fireball _ across the sky./0/flies,fly
Many meteors _ through the sky./1/flies,fly
She _ the heavy telescope to its stand./0/carries,carry
They _ binoculars with them to view the night sky./1/carries,carry
She _ to adjust the telescope to see more clearly./0/tries,try
They _ to see the moons of Jupiter through the telescope./1/tries,try
The moon _ in front of the planet./0/passes,pass
They _ around the binoculars so that everybody can look./1/passes,pass
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