根据汉语意思完成英语句子，每个空格填一个单词。他们每天放学后都按时回家，。
They__________ __________ on time after school every day.每个人看到地上有垃圾，都有义务把它捡起来。
It’s everyone’s duty to ___________ ___________ the litter on the ground.童年时代，书籍使他的生活充满了乐趣。
Books __________ his life __________ pleasure when he __________ young.科学研究不能凭空想象，需要不断实践。
_____________research can’t____________ ___________ , it needs more practising.
As the saying goes，"God helps those who help （他们自己）．"
Now is the time for all Jazz （迷） voices to be heard．
The artist always （表达） his world view in his works．
Although you are young，you can （仍然） make the world more beautiful in your own way．
Our government has made laws to （限制） air and water pollution．