[ Modals ]
The office workers _____ follow the protocol set in their company whatever the situation is.
A. has to
B. must
C. mustn’t
D. must be

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Gerunds as objects of prepositionProgressive Verb TensesImperative SentencesRelative Clauses and UsageTypes of Sentence StructuresModals and Modal PerfectsPrepositions and Prepositional PhrasesGrammar Comma UsageObject PronounsFirst and Second ConditionalOther quiz:
Vocabulary and Grammar › ViewLearning a foreign language is difficult ____ .You have to study a lot.
A. doing
B. to do
C. do
Wish, Unless, If sentence › View
I miss my grandmother. If only she_____ here right now.
A. were
B. could be
C. had been
D. were