在下列各句的空白处填入一个适当的词,使句子意思完整,语法正确。
【小题1】Look! The birds are flying high in the blue ________.
【小题2】Good friends can cheer us ________ when we are unhappy.
【小题3】In the morning, I like to ________ newspapers after I get up.
【小题4】Teenagers should take part ________ more outdoor activities.
【小题5】Don't play computer games too much. It is ________ for your eyes.