The pet dog in your hand is very nice. Is it ?–Yes, but I’ll give it to my friend, Lucy, as birthday present.

Although he is five years old, he has learned more than twenty old Chinese poems_____ heart.[ ]

Recognized as ________ world cultural heritage by the United Nations in 2002, paper cutting is ________ practice which originated in ancient China.

My parents always ________ the best in me and encourage（鼓励） me.

His father ________ in the factory since he was twenty.