Rates for vs. Rates of

When rates means prices charged, it should be followed by for instead of of

State officials report that soaring rates for liability insurance are forcing cutbacks in the operations of everything from local governments and school districts to day-care centers and recreational facilities. - correct

State officials report that soaring rates of liability insurance are forcing cutbacks in the operations of everything from local governments and school districts to day-care centers and recreational facilities. - incorrect


When rate is used as a standard of measure, it should be followed by of instead of for

High rates of sick leave are a concern for all types of organizations. - correct

High rates for sick leave are a concern for all types of organizations. - incorrect

Because vs. In that

You use in that to introduce an explanation of a statement you have just made. 

e.g. I'm lucky in that I've got four sisters

When we use because, we are focusing on the reason. Because is used to express a simple cause effect relationship 

e.g. The boy was absent because he was ill.

Teratomas are unusual forms of cancer in that they are composed of tissues such as tooth and bone, tissues not normally found in the organ in which the tumor appears. - correct

Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone, tissues not normally found in the organ in which the tumor appears. - incorrect

Where vs. In which

Where is used to refer to places only; to refer to events use in which

Stars like the sun can continue to shine steadily for billions of years because their light and heat are produced by nuclear fusion, in which  titanic releases of energy result in the loss of only tiny amounts of mass. - correct

Stars like the sun can continue to shine steadily for billions of years because nuclear fusion produces their light and heat, where titanic releases of energy result in the loss of only tiny amounts of mass. - incorrect

Idioglossia is a phenomenon, incompletely understood at best, where two persons develop a unique and private language with highly original vocabulary and syntax. - incorrect

Idioglossia is a phenomenon, incompletely understood at best, in which two persons develop a unique and private language with highly original vocabulary and syntax. - correct