Tom, it seems that you haven’t cleaned your bedroom the whole week .—You didn’t come in around 10 yesterday morning; I ________ it

The war made ______ impossible for the scientist to goon with his research.

In our school library there _____a number of books on science, and in these years the number of them ____growing larger and larger.

In spite of repeated wrongs done to him, he looks _____to people greeting him.[ ]

. Now everyone is concerned about how to conquer the economic crisis _______ is very important for us to be able to preserve our standard of living.