1. It's a teacher's_________to teach the students well. 2. You shouldn't worry about your problems. You should_________the challenges instead. 3. Worrying about our problems can also_________the way we behave with our families. 4. Tom and I are good friends. I hope our_________will last long. 5. All the villagers are looking for the_________boy in the mountains. 6. Don't talk_________in the classroom. The students are studying.