Read and complete the sentences．（根据汉语提示，完成下列句子。）1.长江比黄河长。
The Changjiang River is_________________than the Yellow River.
2.长城比颐和园古老。
The Great Wall is________ ________the Summer Palace.
3.北京比天津大。
Beijing____________ ________________________Tianjin.
4.萨姆比玲玲强壮吗？
Is Sam____________ ____________Lingling?1.longer
2.older than
3. is bigger than
4.stronger than