下列各句均有一处错误，请指出并改正。
1. I’ve heard a whisper she’s going to marry Bill soon.
2. I do believe it is possible for different ethnic groups to live together with harmony.
3. If Bob’s wife doesn’t agree to sign the papers, so will he.
4. No sooner they got to the plant than they started to work.
5. Such loudly did he speak that even people in the next room could hear him.
6. Not until Mr. Smith came to China didn’t he know what kind of a country she is.
7. Not only did Mary complained about the food, but also refused to pay for it.
8. Victory is by hand, so we should keep on fighting.
Key:
1. whisper后加that     2. with → in     3. so → neither/nor 
4. sooner后加had     5. Such → So    6. didn’t → did
7. complained → complain     8. by → at