黄油在热锅里很快就融化了。

The butter ___melts quickly in the hot pan.

黄油在锅里慢慢融化。

The butter ___melts slowly in the pan.

冰激凌在阳光下很快就融化了。

The ice cream quickly ___melts in the sunlight.

看到孩子们纯真的笑容，她的心都要融化了。

The children's innocent smiles ___melt her heart completely.