[ 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:
Grammar › ViewWhich is correct?
A. The boys were friends since they were eight.
B. The boys have been friends since they were eight.
Grammar › View
A: You’re very good at public speaking.
B: Thanks, but when I was young, I ……….. face a crowd.
A. mustn’t
B. couldn’t
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?