______ you understand this rule, you’ll have no further difficulty.
| A．while | B．Once | C．Though | D．Unless |
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
| A．who | B．that | C．where | D．before |
All the scientific evidence ____ that increasing use of chemicals in farming ____ damaging our health.
| A．show; are |
| B．shows; are |
| C．show; is |
| D．shows; is |
（2012江苏卷） There is little doubt in your mind that he is innocent, _______________?
| A．is there | B．isn't there | C．is he | D．isn't he |
（2012浙江卷） Had they known what was coming next, they________ second thoughts.
| A．may have | B．could have | C．must have had | D．might have had |
— I don’t know about you, but I’m sick and tired of this weather.
— _________. I can’t stand all this rain.
| A．I don’t care | B．It’s hard to say |
| C．So am I | D．I hope not |