[ Modal Verbs ]
It is a modal verb that is used to express obligation or necessity, and is often used when an external requirement is imposed, rules or law statements.
A. should
B. have to
C. must
D. be allowed to

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Types of Simple SentencesGerund vs InfinitiveSimple Past/Past ProgressiveFew, a few, little, a littleSo - Too - Either - NeitherPrepositions of Time and PlacePronounConditional Sentence Type 0-3Prepositions Of PlaceAction VerbOther quiz:
Grammar › View___ to the airport?
a. How far is
b. How far is it
c. How distance is it
Phrasal Verb › View
Dentists ……that cleaning teeth after meals and avoiding eating sweets and sugary foods prevent tooth decay.
A. Give away
B. Get over
C. Point out
D. Give in
