It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
| A．from; if | B．of; unless | C．from; unless | D．of; if |
The policeman stopped the stranger and asked him where he __________．
| A．hung up | B．hung together |
| C．hung out | D．hung on |
_________ you are right in refusing to join that club.
| A．In a sense | B．In the sense |
| C．At a sense | D．At the sense |
Life is like a long race __________ we compete with others to go beyond ourselves.
| A．why | B．what |
| C．that | D．where |
—Come on，please give me some ideas about the project.
—Sorry.With so much work __________ my mind，I almost break down.
| A．filled | B．filling |
| C．to fill | D．being filled |
Mr.Jones，__________ as a famous writer，is popular with his readers.
| A．known | B．knowing |
| C．to be known | D．having known |