[ Grammar ]
_______is necessary for the development of strong bones and teeth.
A. It is calcium
B. That calcium
C. Calcium
D. Although calcium

Random Topics:
Verbal and Appositive PhrasesPrepositionWorld Literature VocabularyModal and Phrasal VerbsTenses and PronounsLinking WordsUncountable NounsModals for DeductionRelative PronounGrammar - Collective NounsOther quiz:
IELTS Grammar › ViewShe didn’t ________ to wait long for the bus, only a few minutes
A. got
B. ought
C. have
Preposition and Preposition Phrase › View
The roof is __ my head.
A. up
B. upon
C. on
D. above
Idioms › View“Open a can of worms” means….
A. share information that complicates the situation
B. getting ready to go fishing
C. openings up a can with stinky food
D. having a difficult time
Grammar › View
That smells good! What ________
A. do you cooking?
B. are you cooking?
C. do you cook?
