The question under discussion here is ______ of the "white pollution".
| A．that | B．which | C．one | D．it |
The task is too much for him, so he can’t continue ______any longer. He must get some help.
| A．singly | B．simply | C．alone | D．lonely |
I haven’t seen______ this since I collected stamps.
| A．as beautiful a stamp as | B．so anbeautiful stamp as |
| C．stamp as beautiful as | D．as anbeautiful stamp a |
I am afraid that his answer is _____ from correct.
| A．far | B．free | C．different | D．short |
Professor Smith has written some novels, but he is _____ known for his plays.
| A．the best | B．more | C．better | D．the most |
How beautifully Mary sings! We have never heard _____ voice.
| A．a better | B．a best | C．the better | D．the best |