[ Modal Verbs ]
They live in a very big house.They____be rich.
A. must
B. may
C. have
D. should

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Conjunctions and CommasDo not- Does notModal Verb Gerund or To InfinitivePrepositionPresent Simple and Present Continuous TenseFuture - will / going to / present continuousVerbal PhrasesGerund vs InfinitiveArticle and Order of AdjctiveDaily Routines & TensesOther quiz:
Irregular Verb › ViewMy first car was good, but its insurance … (cost) so much.
- cost
- costed
- costs
Grammar › View
________ public transportation is cheaper, most people prefer driving their own cars.
A. Whereas
B. Until
C. If
D. Although