[ 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:
Tenses › ViewEver since I got a credit card, I __________ a lot of money on many unnecessary things.
A. have spent
B. spend
C. am spending
D. spent
Definite and Zero Article › View
_ president of _ United States lives in _ White House
A. -, the, –
B. The, -, a
C. The, the, the
D. The, -, the
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