At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.
| A．take in, give out | B．take up, give off |
| C．take in, give in | D．take off, give up |
The fact that she can't talk makes ________ difficult for her to communicate with her new classmates.
| A．so | B．much |
| C．such | D．it |
—May I ask for leave tomorrow?
—No, you can't. ________ applying for the scholarship must be present.
| A．Someone | B．Anyone |
| C．One | D．No one |
New words selected by the dictionary are closely linked to social phenomena. Instead of being merely words, they are ________ cultural symbols.
| A．both | B．neither |
| C．either | D．all |
—Have you figured out how much the tuition is in American universities?
—$19 000 or ________ like that.
| A．anything | B．everything |
| C．nothing | D．something |
________ in my life impressed me so deeply as my first visit to Qinghai Lake.
| A．Anything | B．Nothing |
| C．Everything | D．Something |