_______ basic first-aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known |
| C．Knowing | D．Being known |
The question is too difficult and we found ________.
| A．it not easy to answer it | B．it was not easy for us to answer it |
| C．it’s not easy to answer | D．it not easy to answer |
He had to speak in a loud voice in order to make himself_________.
| A．hear | B．hearing |
| C．heard | D．to be heard |
Judy didn’t answer . ______ , she turned and walked away.
| A．But | B．However |
| C．Instead | D．And |
I was tired _____ listening to classic music. Let’s listen to the pop songs.
| A．with | B．of | C．to | D．in |
At horse races, everyone has already studied the form (类型) of the horse______.
| A．behind time | B．in progress |
| C．in advance | D．in time |