小儿体格发育最快的时期是（）
重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)
重写句子：Ihavecheckedmydocumentsseveraltimes.Istillcan’findttheproblem.(compoundsentence)
重写句子：Weslippedontheroadwhenwecouldseenolightsintheheavyrainthatnight.(periodicsentence)
Theoceansdonotsomuchdividetheworld_______uniteit
