1.Factories must clean the water so that it won't pollute rivers or lakes.(保持原句意思)
问题描述：
1.Factories must clean the water so that it won't pollute rivers or lakes.(保持原句意思)
Factories must clean the water so _____not______ pollute rivers or lakes.
2.The government killed 14,000 chicken to stop the bird flu from spreading.(保持原句意思)
The government killed 14,000 chicken ______ ______ the bird flu can be stopped from spreading.
3.He is the tallest in his class.(保持原句意思)
No one ______ in his class is ______ than he.
4.The vase is too expensive for her to buy.(保持原句意思)
She is not______ ______ to buy the vase.
答
1.as to; 2.so that;3.else taller ; 4. rich enough