4、risn’t______togotoschool.A.enougholdB.enoughyoungC.oldenoughD.youngenough()12.The weather in Harbin is colder than _____. A. it in Beijing B. BeijingC. that in Beijing D.in Beijing ()13.Beijing,thecapitalofChina,isoneof__________citiesintheworld.A.thebiggestB.biggerC.mu