___herself wondering whether she had made a mistake, she felt embarrassed and at a loss.

 The maker of the popular game Angry Birds announced on Tuesday that it would open its first overseas operation in Shanghai, _____ a clear step to further enter the booming Chinese market. 

English teachers are supposed ________ their students a test in class, even after class, ________ better teaching results.

Generally speaking, prices of daily goods ______ through the Internet are lower than store prices．

I prefer taking exercise in my spare time ＿＿ healthy.