[ Tenses ]
They … for an hour before the doctor came.
- had been waiting
- waited

Random Topics:
Grammar, adverbs of frequency placementAdjective SuffixesVerb ConjugationGerund or InfinitiveGrammar MistakesPersonal Pronouns and VerbPresent Continous TenseModals and InversionPassive and Active VoiceGender and GrammarOther quiz:
Vocabulary › ViewMy brother is very talented. He can play 10 different _______ instruments.
A. musical
B. music
C. musician
D. musically
Grammar - Capitalization and Possessive Nouns › View
Tell whether each underlined possessive noun is singular or plural: Can you see the lion’s paws?
A. singular
B. plural
Homophones › ViewCan I go with you ______?
A. To
B. Too
C. Two
Grammar › View
There _________ to be a delay .
A. seem
B. seems