A survey was carried out on the death rate of those who were infected by Ebola Virus, __________were frightening.
| A．of that results | B．of which results |
| C．the results of that | D．the results of which |
You don’t need ____ so early.
| A．leave | B．left | C．to leave | D．leaving |
I need some paper _____.
| A．to write | B．to write on | C．to write with | D．writing in |
His speech is easy _____.
| A．to follow | B．to be followed | C．for being followed | D．to follow it |
Physics is difficult ____.
| A．to be learned | B．to learn | C．to be learning | D．to be learn |
English is too hard __ for some people.
| A．to be master | B．to master it | C．to master | D．master |