often ______ as an activity for youngerchildren, is still important in the social development of teenagers.

It was ______ cold winter night and the moon was shining brightly across ____ night sky.

My daughter________ hard for more than one year to realize her dreamjoining the Party and now her dream comes true.

He has left out the most important reason why he last night .

______to the Internet ,as many adolescents do ,will to some extent have a negative effect on their mental and physical health .