[ Subject Verb Agreement ]
The Earth and Pluto (is / are) the only two planets in the solar system believed to have a single moon.
A. is
B. are

Random Topics:
going toAdverb of ConcessionHave vs. HasPresent Simple and Continuous TenseGrammar MistakesPreposition (at,in,on)Modals and InversionFuture Simple TenseWould/would like - affirmative/negativeProverbsOther quiz:
Grammar › ViewPatty ____________been at the mall last night. She was out of town visiting her mother.
A. couldn’t have
B. must have
C. mustn’t have
D. could have
Prepositions of Time, Place, and Movement › View
I’m very tired. I prefer to stay… home.
A. at
B. next to
C. under
Grammar › ViewI always listen to people very _________.
A. careful
B. carefully
Grammar › View
I (type) ____________ the letter all day.
A. have been typing
B. have typed
C. has been typing
D. has been typed
