[ Grammar and Vocabulary ]
My mother ____ old clothes while my father ………… the food packages for the next voluntary trip.
A. was classifying – was preparing
B. was classifying – prepared
C. classified – was preparing
D. classified – prepared

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Grammar › ViewHe can’t find ___ keys anywhere.
A. him
B. he
C. himself
D. his
Grammar Clauses › View
Which word is not a preposition?
A. before
B. to
C. at
D. whenever