He found his son________by letters and papers and________very worried.

A cook will be immediately fired if he is found ________ in the kitchen.

 The how­to book can be of help to________wants to do the job.

 ________wants to stay in a hotel has to pay their own way.

The magnificent tower must be saved，________the cost!

_______hungry I am，I never seem to be able to finish off this loaf of bread.

—You know，I’m poor in Chinese，you are not good at English，and...

—That’s________we should help each other.

 Water，which seems so simple and common，is________makes life possible.

Sorry I’m so late，but you cannot imagine________great trouble I took to find your house.

Professor Backman took up scientific research for decades，and this is________he devoted all his life to.