[ Narrative Tenses ]
The burglar _____ to open the safe when he _____ the owner come in.
A. tried/heard
B. was trying/heard
C. had been trying/had heard
D. tried/was hearing

Random Topics:
Infinitives for reasonsGrammar, Literature, and VocabularyPast Perfect SimplePassive Voice in Past Simple TenseContinuous and Perfect TensesIndirect SpeechTenses: Present simple, Past Simple, Future SimpleVerb PhrasesDescriptionsGrammar - TOEICOther quiz:
Vocabulary & Grammar › ViewAny language other than that spoken by the people of a specific nation …
A. second language
B. first language
C. native language
D. foreign language
Gerund Subject or Object › View
They postponed meeting until next week.
A. Subject
B. Object