[ Vocabulary ]
something very difficult and demanding, requiring a lot of effort
A. consecutive
B. rigorous
C. energetic

Random Topics:
Wh- Questions Present Simple TenseGrammar and PrepositionFuture Tense VerbIELTS VocabularyIN, ON & ATPhrase vs ClausePreposition of PlaceAdverb of ConcessionConditionals and WishesPresent and Past TensesOther quiz:
Some vs. Any › ViewI’ve got ___ sweets for you.
a. some
b. any
Simple Future Tense › View
I ________________ the dog later.
A. will walk
B. walk
C. walks
D. walked
Grammar › ViewMr. Osama said that Hana …………. an intelligent girl.
A. will
B. was
C. is
D. has
Past Tenses › View
Matt ______, while we________ lunch.
A. phoned, were having
B. was phoning, were having.
C. had phoned, had had
D. had been phoning, had been having