– What a hard chair! --Yes, it is. But in fact, it is very comfortable to _____.
| A．sit | B．sit on | C．be sat | D．be sat on |
________the working efficiency, the boss allows the employees to have a coffee break.
| A．Improving | B．To improve | C．Having improved | D．Improved |
Only when he read this novel for a second time ________ to appreciate its beauty.
| A．that he began | B．he began |
| C．had he begun | D．did he begin |
I ________ the boy to save the money, but he would not listen to me.
| A．persuaded | B．advised |
| C．suggested | D．insisted |
--- And then the ________ wind blew the roof off.
--- Oh, you must have been ________.
| A．frightened, frightened | B．frightening, frightened |
| C．frightened, frightening | D．frightening, frightening |
Could people become infected ____ HIV by swimming in a pool or sitting in a bath?
| A．of | B．into | C．with | D．to |