[ Grammar ]
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:
Grammar › ViewI have ___ experience with them. I need to learn more.
A. a little
B. really
C. so much
Grammar › View
The boys hurt ________ playing football in the park.
A. themselves
B. themself
C. theirselves
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
