___can help the tree grow.And trees help clean the___.A.Suns

___can help the tree grow.And trees help clean the___.A.Suns Trees can help _____ the air in the city.A to clean B clean help,air,trees,the,keep,clean连词成句句号 run to the tree and help them trees help keep the air clean help后可以直接跟keep吗 help clean the house,the classrooms and the streets意思 //give the students lessons.water the trees and flowers.help come and help me plant trees in the garden!_________________ Trees help to k___ the air clean.其中k___能添什么单词? planting tree can help( )the air clean 是用keep 的什么时态? If we all think _____ ,we can help grow trees. 英语20.A clean environment can help the city