His sister left home in 1998, and__________ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
—Why did you get such a low mark on that test?
—It’s mainly because I seldom _______ the teacher’s advice, I think.
| A．regard | B．repeat |
| C．reward | D．remind |
I have battled with my _______ whether I should keep the extra money given to me or return it to the seller.
| A．awareness | B．conscience |
| C．commitment | D．competence |
— It’s difficult to buy a ticket online because of the 1 billion clicks daily.
—_____________. There can be errors for every single step.
| A．Forget it! |
| B．Don’t mention it. |
| C．Nothing is impossible. |
| D．I can’t agree with you more. |
We haven’t reached any agreement in the discussion ______ neither side would give way to the other.
| A．unless | B．when | C．as | D．though |
The worst thing about the do-it-yourself game is ______ sometimes even men live under the delusion（错觉） ______ they can do anything, even when they have repeatedly been proved wrong.
| A．that；what | B．what；which |
| C．that ；that | D．what；that |