All the scientific evidence ________ that increasing use of chemicals in farming ________ damaging our health.(2012·湖南)
13. English we must work hard at it.
12. He said he was not optimistic the future of that country.
11. The little boy many questions at me, leaving me embarrassed.
10. -----Can you attend the meeting tonight? -----No,the manager about something important.
9. It long before we the result of the experiment.