1. once in a while ____________ 3. translate…into ____________ 5. on one's way home ____________ 7. mother tongue _____________ 9. ask for a ride ______________
2. 练习做某事 _____________ 4. 取得进步 _____________ 6. 放弃 ______________ 8. on business ____________ 10. 实现 ___________
