题目内容：

完成句子。（每空一词）

1.They bought a house in 2012.（改为同义句）

They______  _______a house since 2012.

2.We ought to be polite to the old.(变否定句）

We______  _______be polite to the old.

3.There is something delicious on the table.（改为一般疑问句）

______  there ________ delicious on the table?

4.尽管他很富有，他仍然过着简朴的生活。

______   _______he is rich, he lives a simple life.