appeal tofocus onget hold ofin a bid tolaunch sb. onnot have a cluespeak ofturn to1. His high personal ambition____ a series of detailed explorations of academic subjects in the late 2000s.2. In the last few years,____ attract younger audiences, online and television commercials have worked hard to become more interesting.3. A growing number of college football programs have____ technology to help keep players safe and improve their performance.4.____ learning English. China has most of the learners in the world, who usually start learning English in childhood.