____ that caused him to serve dinner an hour later than usual.
| A．It was we being late | B．It was our being late |
| C．It was we were too late | D．It was because we were late |
—I'm so sorry about last night—it was all my fault.
—________.
| A．Forget it | B．No way |
| C．Go ahead | D．My pleasure |
—Shall I help you with the math problem?
—________.
| A．If you wish | B．With pleasure |
| C．You're welcome | D．That's right |
—Why don't we just leave it until tomorrow?
—________ I'm dead tired today.
| A．Forget it. | B．I couldn't agree more. |
| C．It all depends. | D．Don't mention it. |
—I forgot my mother's birthday!
—________ Better keep it in mind next year.
| A．I'm afraid so. | B．So what? |
| C．You did? | D．No wonder. |
—Would you mind giving me a lift?
—________. I am happy to.
| A．Not at all | B．Don't mention it |
| C．Never mind | D．You don't say so |