[ Tenses ]
When Carol _________ dinner, someone __________ on the door.
A. was cooking/ was knocking
B. was cooking/ knocked
C. cooked/ knocked
D. cooked/ was knocking

Random Topics:
Preposition FormPrepositions & Modal VerbsModal AuxiliaryActive-Passive VoicesFigurative LanguageProgressive TenseNo Excuse Words / Conjunction SOGrammar and SyntaxActive vs. Passive VoiceGrammar - too & enoughOther quiz:
Countable Noun › ViewPlease, buy me a __________ apples for the cake
A. Few
B. Little
C. Some
Modal Verbs › View
We _____ play hide and seek in the backyard every summer.
A. will
B. might
C. would
Prepositions › ViewDavid is always _____ time.
A. in
B. on
C. with
Homonyms › View
Meet me in the back ___.
a. lain
b. lane
