It is vital that we _____ act out at once to protect the environment.
| A．would | B．should | C．will | D．can |
I feel __________ to tell you that you're drinking too much.
| A．guilty |
| B．duty |
| C．proud |
| D．bound |
Along with the letter was his promise __________ he would visit me this coming Christmas.
| A．which |
| B．that |
| C．what |
| D．whether |
The idea has widely been accepted __________ man should live in harmony with nature.
| A．that |
| B．which |
| C．when |
| D．where |
There's a feeling in me __________ we'll never know what a UFO is.
| A．that |
| B．which |
| C．of which |
| D．what |
Information has been put forward __________ moremiddle school graduates will be admitted into universities.
| A．while |
| B．that |
| C．when |
| D．as |