句型转换1.Too much frozen food is bad for our health.Too much fr

句型转换
1.Too much frozen food is bad for our health.
Too much frozen food is ____ ____ our health.
2.Mary runs very fast.She can get the first prize in the race.
Mary runs fast____ ____ be ____ _____ get the first prize in the race.
3.After he had finished making the model,he showed it to the teacher.
After _____ _____ the model,he showed it to the teacher.