In spring,we can hear birds -----(sing) in the trees

In spring,we can hear birds -----(sing) in the trees We often hear a lot of birds ___(sing) in the trees in the m Can you hear the birds sing in the morning? 全文介绍校园,无现在进行时,问We can hear the birds _____(sing) in the tree Listen!Can you hear birds（ ）in the tree?A.sing B.to sing C.s Can you hear birds _____(sing)in the tree outside the window I can hear many birds________ in the trees.A.to sing B.singe in spring,birds sing,and flowers grow.we wear shirts.in summ in the country,we can hear birds singing and sheep bleating I suggested that we ( )trees in the park in spring I ofent hear birds ____(sing) songs in the tree in the morin In spring,the trees are_________.