_, I cannot accept yourinvitation Hopefully, we’ll get together some time next year

ou talk about a person’s _____, you are referring to thecountry, race, or social class of their parents or ancestors

With the development of high technology, more and more new things _______ to the field of IT

sly, the ability to talk is ______ that marks humans off from animals.

The classroom is not________ clean ______it was yesterday .—Sorry, I forgot to clean it.