[ Modal Verbs ]
If there is fuel shortage, solar energy ____.
A. has to develop
B. will have to be developed
C. will have to develop
D. had to be developed

Random Topics:
To Infinitive or Bare InfinitiveParticiple - ing/ ed-ing &-ed AdjectivesComparatives - SuperlativesSecond Type ConditionalSubordinating and Coordinating ConjunctionsPhrase and ClauseFinite and Non-Finite VerbSimple Past TensePrepositions and TensesOther quiz:
Prepositions › ViewHis headaches stemmed_car accident
A. of
B. on
C. from
D. in
Grammar › View
Which answer is closest to abandoned?
A. torn down
B. left empty or alone
C. made more beautiful
D. built up
Vocabulary › ViewThe coach called a time-out to _____ strategy.
A. discuss
B. analogy
C. composition
D. descend
Modal Perfect › View
Was it really necessary? You ________________ tell the police, you know.
A. can’t
B. mustn’t
C. can’t have
D. didn’t need to