Tom and Mary are still discussing the math exercise with each other because they ____ how to do it.
A. aren’t working out
B. haven’t worked out
C. haven’t been working out
D. didn’t work out

Random Topics:
Modals and TensesPresent Tense vs Past TenseRegular and Irregular AdverbPast Continuous vs Past SimpleFormal & Informal WordsAdverbs, Modals, Preposition of timeVerb + PrepositionBe used to vs used toSimple Past ContinuosVerbsOther quiz:
Countable & Uncountable Nouns › ViewWe’re just moved into our house, and we haven’t got ___
A. a furniture
B. any furniture
C. some furniture
Tenses › View
Identify the tense of: The sun was shining brightly as they walked along the beach.
A. Simple Past Tense
B. Past Continuous Tense
C. Simple Present Tense
D. Past Perfect Continuous Tense
Grammar › ViewThe first large predators on Earth, according to some sources, was sea scorpions that grew to almost six feet in length.
A. NO CHANGE
B. were
C. is
D. has been
If Conditionals › View
You ____ junk food if you ____ get fat.
A. eat/want to
B. won’t eat/will want to
C. should eat/don’t want to
D. shouldn’t eat/don’t want to
