Tina wants to be a singer __________ she is good at singing.
A. though
B. so
C. because
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__________you didn't sleep last night, you may take a rest now.
A. When
B. Since
C. Once
Ability is__________ than a certificate.
A. important
B. more important
C. the most important
Harry Potter is a __________ book series written by J. K. Rowling.
A. popular
B. more popular
C. the most popular
Of these two handbags, I'd like to buy the __________ one
A. less expensive
B. expensive
C. least expensive