With more and more farmers moving to cities, an inadequate labor force is    becoming a major factor affecting the country's grain output.

(2013·高考辽宁卷)Everything seemed to be going ________for the first two days after I moved to New York.

These machines can help recycle the waste which would ______be thrown away.

While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.

---It is what parents say and do that really matters in children’s character training.---________.