If a computer crashes,you will lose the file you _____ on unless you save it regularly.
| A．are working | B．work |
| C．will work | D．worked |
| A．stand | B．stands | C．to stand | D．to stands. |
| A．what | B．that | C．which | D．Why |
—Sorry, he isn’t in. This is his assistant speaking. Can I help you?.
—______.
| A．Oh, you can | B．Oh, it’s a pity |
| C．I hope to see him soon | D．I should think so |
| A．As | B．For | C．With | D．Through |
| A．when, that | B．that, which |
| C．when, which | D．that, when |