_____the beginning of the 19th century did scientists know that all matter is made up of atoms.A,At B,By C,Up to D,Not until
The majority of people in the town strongly ___ the plan to build a playground for children.
His first book ___ next month is based on a true story.
—What shall we do tonight then?___ —whatever you want
Only when your identity has been checked ___.
The computer was used in teaching. As a result, not only ___, but students became more interested in the lessons.