I think that ____ very difficult to learn.

There ______ some sheep and a dog at the foot of the hill.

  When the injured _____ to the hospital , they came to          .

 ----A number of people_____ready to work in poorareas in the western part of China ----Yes,the number______getting________.

The country’s population ______ small, and most of its population ______ in the mountainous areas．