1.Factoriesmustcleanthewatersothatitwon'tpolluteriversorlakes.(保持原句意思)
Factoriesmustcleanthewaterso_____not______polluteriversorlakes.
2.Thegovernmentkilled14,000chickentostopthebirdflufromspreading.(保持原句意思)
Thegovernmentkilled14,000chicken____________thebirdflucanbestoppedfromspreading.
3.Heisthetallestinhisclass.(保持原句意思)
Noone______inhisclassis______thanhe.
4.Thevaseistooexpensiveforhertobuy.(保持原句意思)
Sheisnot____________tobuythevase.