[ Past Perfect and Past Perfect Continuous ]
I ….about that book until you mentioned it.
A. hadn’t heard
B. hadn’t been hearing

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Tenses › ViewPasteur ________ in the 19th century.
A. was living
B. lived
C. had lived
D. has lived
Grammar › View
I didn’t know ______ book that was.
A. Who
B. Whom
C. Whose
Conjunctions › ViewWe cannot travel to the sun…………..it is very hot.
A. but
B. because
C. if
D. when
Articles › View
____ Love is a powerful emotion.
A. a
B. an
C. the
D. no article