The kitchen is a complete mess! What ___ (the children/do)?
A. Have the children done
B. Has the children done
C. Have done the children
D. Has done the children

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Modals of AdviceGerunds, Infinitives and ParticiplesGender and GrammarPassivisationPassive of Modal VerbsPast Perfect and Past Perfect ContinuousVerb Tenses and UsageApostrophe GrammarTenses and ArticleGrammar Past and Future TenseOther quiz:
Narrative Tenses › ViewWhat is the meaning of the phrasal verb ‘pick up’ in case of language learning?
A. to quickly improve a skill, especially when you haven’t used it for a long time
B. to absorb, understand
C. to learn a new skill or language by practising it rather than being taught
D. to manage to live or do a particular thing using the money, knowledge, equipment, etc. that you have
Vocabulary › View
Ist
A. One who believes in
B. Warn
C. Exaggerated fear
D. Killing
If it’s “safe and sound”, it’s ___.
a. not allowed
b. beautiful
c. not harmed
Grammar › View
To do something bad without being punished for it.
A. Get away with
B. Put up with
C. Come up with