_______all his efforts he failed, he was so upset about himself that he felt like crying.
| A．So long as | B．In terms of | C．In spite of | D．regardless of |
So absorbed _____ in the experiment that he didn’t even notice it was already over 12 o’clock.
| A．did he | B．he did | C．was he | D．he was |
Tell your doctor with a detailed medical history ______ he can give you the accurate treatment.
| A．even if | B．so that | C．in case | D．as though |
— Nowadays people seem to be becoming more and more selfish.
— How much better life would be if we ______ to the values of the past!
| A．would return | B．had returned | C．return | D．were to return |
— Who _____ be phoning us at this time of night?
— It might be your sister.
| A．might | B．can | C．dare | D．must |
— You have helped me a lot. I can’t thank you enough.
—______.
| A．Be my guest. | B．That’s right. | C．I don’t think so. | D．Think nothing of it. |