填空题

Infants use all their senses to learn the world. They "talk" with (1) ______
others through actions and sounds, experiment with objects and noises. (2) ______
They enjoy watching the results of their actions. This is how children
learn, make sense of the world, and learn to communicate. When the (3) ______
babies coo, babble, and interact with others, they are developing
language skills.
Children quickly begin to understand the meanings of symbols—that a
smile and pleasant tone of voice mean the person speak to them is happy, (4) ______
that dimming lights mean it is naptime, and that putting on a coat means a (5) ______
trip to outside.
Young children think that when they cannot see to someone and (6) ______
something, it is gone forever. When important people in their lives leave,
they do not understand that they will return. This period of development
is hard with parents and children. (7) ______
Parents can make these times less stress by letting a child hold and (8) ______
keep personal objects, such as stuffing animals, blankets, or a family (9) ______
photo. Around the second year of life, children begin to form mental
pictures of objects, and that makes easier for them to say goodbye to (10) ______
moms, dads, and other people they are about.