OurEnglish teacher devoted herself____ to her teaching and it earned her a good reputation in our school

What’s your plan for this winter vacation—I’ll take an express train to Shanghai for my holiday___________ school ends.

The boy isn’t old enough ________ with thedifficult problem by himself.

Teenagers should be cautious about the content on social networking sites, for their tastes and preferences ________ by what they see in the media.

Audrey Hepburn, one of the greatest actresses, was ___ to take on challenges in her life.