Let's practice____together. A.sing B.to sing

Let's practice____together. A.sing B.to sing let's to sing a song改错 Let's sing a song t______ let`s song a sing什么意思 Let's sing a song together ,_? He is often heard -----in the next room.A sing B to sing C s She was heard __A______ an English song.A.to sing B.sing C.s Listen!Can you hear birds（ ）in the tree?A.sing B.to sing C.s Let's do something at the part.What about___?A.to sing;to da Let the boy in green _____ a song ______ us.A.sing; to B.to Let\'s start sing the 1peter failed in the exam let's sing a song to make him happ