[ Gerunds and Infinitives ]
A responsible teenager is someone who is willing to _____ the school.
A. serve
B. serves
C. serving
D. can serve

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Grammar › ViewThey … a test every week.
A. does
B. has
C. are
D. have
Present Perfect Tense › View
I _________________ to Oregon twice last year
A. have been
B. has been
C. went
D. was going