Our teacher wasn’t blaming anyone ; he _______ said errors like this could be avoided．

 Jogging is an effective way to keep fit. _____ , swimming is helpful for bodybuilding.

. Dream of the Red Chamber is _____ worth _____ because we can learn a lot about the noble families in the feudal society.

_____ the woman entered the office, Tom’s eyes lit up.

Although I majored in English, language _______ became a challenge when I set foot in the USA for the first time.