John waited at the bus-stop for nearly half an hour the bus finally arrived .
| A．when | B．as | C．before | D．while |
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 |
We must keep our room clean, for dirt and disease go______.
| A．hand in hand | B．step by step | C．from time to time | D．one after another |