[ Grammar ]
The whole world is waiting _____ a vaccine against Covid-19.
A. by
B. in
C. to
D. for

Random Topics:
-ed/-ing AdjectivesGrammar : Must (Necessity)Superlative AdjectivesComparative Adjectives and AdverbsGrammar and Sentence CorrectionNouns, Articles, DeterminersSimple and Progressive Verb TensesSubordinating ConjunctionFor vs SincePronouns of QuantityOther quiz:
Modal Verbs › View___ they come to the concert tonight?
A. Can
B. Must
C. Should
D. Can’t
Grammar › View
My brother ________to the dentist yesterday.
A. Want
B. Goes
C. Went
D. None of the above