翻译(单词短语翻译)。
1. practice v. ________________
2. develop(v.) ________________
3. 记住(v.) ________________
4. 准备 v. ________________
5. improve (v.) ________________
6. be stressed out ________________
7. remember to do sth. ________________
8. 练习做某事 ________________
9. 代替 ________________
10. 为……做准备   ________________
11. at once ________________
12. worry about ________________
13. over and over again ________________