217. Phoebe thought that Tim owed her a(n) _____ for their unfinished report. She should not be the only one to blame when the teacher asked about it.
(A)exhibition
(B)explanation
(C)success
(D)representative
470. _______ is a natural science involving the study of matter and energy and the effect that they have on each other.
(A) Biosphere
(B) Satellite
(C) Physics
(D) Fiction
630. The company is in danger of bankruptcy because it fails to _____ the financial losses in previous economic recession.
(A) engage (
(B)erupt
(C)endure
(D)escort