______ acupuncture developed, the simple “bian stones” were replaced first by stone and pottery needles, and ________ by metal needles.
Only when you study abroad the importance of English.
Many Chinese students speak English with a strong Chinese ,but foreigners can understand what they say.
After doing series of exercises, he finally passed driving test.
Studying Wendy’s menu, I found that many of the items are similar to _____ of McDonald’s.
Educationists across China are experimenting and________ new assessing systems appropriate to assess(评价) students' performance in school.