[ Tenses ]
Before I started the car, all of the passengers …………….. their seat beats.
A. will buckle
B. had buckled
C. buckle
D. have buckled

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Conjunctions › ViewShe works hard ___ earn enough money for her family.
A. in order to
B. so that
C. because
D. so
Grammar › View
The letters ___ (send) every day.
A. are sent
B. is sent
C. were sent