________, Nathan gave back the enormous amount of money he found.
| A．To his sorrow | B．To his joy | C．To his surprise | D．To his credit |
—I’m sorry to have kept you waiting.
—____, Bill.
| A．You’re welcome | B．Go ahead |
| C．Don’t mention it | D．No problem |
Ten years ago, the population of our village was ______ that of theirs.
| A．as twice large as | B．twice as large as |
| C．twice as much as | D．as twice much as |
She has been working hard day and night, which of course, _______ her pale face.
| A．accounts for | B．stands for |
| C．goes for | D．answers for |
--- Are you satisfied with what he did?
--- No. It couldn’t have been ______.
| A．worse | B．better | C．so bad | D．the worst |
--- He worked out such different questions at a very young age.
--- Oh, he ______ a very smart student then.
| A．could have been | B．should have been |
| C．might have been | D．must have been |