[ Modals ]
Customs in different countries …… vary widely and it’s sometimes difficult to know how to behave.
A. ought to
B. can
C. must
D. should

Random Topics:
Gerunds in SentencesDependent PrepositionsWill or Going toWh-QuestionPresent simple, Present continuous, Singular, PluralGrammar Past and Future TenseComparisionSentence Adverbs & Third ConditionalRelative Pronoun/AdverbsModals and ResponsibilitiesOther quiz:
Grammar › ViewThe book ……. written by a famous author.
A. is
B. has been
C. will be
D. was
Vocabulary › View
a scientific test to try out something in order to learn about it
A. eyewitness
B. firsthand
C. theory
D. experiment
Coordinating Conjunctions › ViewI want to eat healthy, _____ I need to stop buying junk food.
A. or
B. but
C. so
D. for
Future Tenses › View
They __________ their vacation by the end of the year.
A. will plan
B. will be planning
C. will have planned
D. are going to plan
