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 |
The on-line diary blog is a cultural _____, perhaps as essential as usual books we read.
| A．network | B．phenomenon | C．competition | D．occupation |
Jackie made _____ possible for this family to have beautiful memories during hard time.
| A．it | B．this | C．that | D．what |
Only after he realized the significance of mastering two languages ______ English carefully.
| A．did he set about learning | B．did he set out learning |
| C．had he set about learning | D．had he set out learning |
If you had arrived half an hour earlier, you _____ the well-known writer in the flesh.
| A．had met | B．would have met | C．would meet | D．could meet |
This is perhaps one of _____ important reasons why so many people write ____ poetry.
| A．a ; the | B．the ; the | C．the; 不填 | D．a; 不填 |