为了完成这个项目，他必须全力以赴。
He had to ___exert all his energy to finish the project.
她竭尽全力解决那个复杂的数学问题。
She ___exerted herself to solve the complicated math problem.
她在考试前努力复习，付出了很多精力。
She was ___exerting herself a lot to study before the exam.
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