[ Countable - Uncountable ]
It is said that 4 litres of water ___ to be be drunk a day.
A. has
B. have

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Homophone & HomonymFuture - will / going to / present continuousPresent / Future / Present Progressive / non Action VerbsPreposition on TimePresent Simple and Modal VerbsPast, Present, FuturePresent Simple for Future ArrangementPresent Simple and Continuous TensePast Continuous Tense & Past ModalsConjunctions - ConnectorsOther quiz:
Tenses › ViewIn the next thirty years, all fossil fuels __________ replaced by eco-friendly energy sources.
A. are
B. are being
C. will be
D. have been
Past Tenses › View
The students _______ (study/studies/studied/studying) hard for the exam.
A. study
B. studies
C. studied
D. studying
