根据句子要求转换句型（共5小题，每小题2分，满分10分）

1.Xi’an is one of the few cities with city walls. Its walls remain as good as before. (两句合为一句)

Xi’an is one of the few cities __________________________________________.

2.She didn’t spend much time in reaching the standard for entering the Olympic Games. （同义转换）

___________________________________ the standard for entering the Olympic Games.

3.His mother told him not to waste time on computer games. （改为被动句）

___________________________________________________________________

4.By now, the government has spent a lot of money in protecting the old temple. （改为被动句）

____________________________________________________________________

5.And my memory became too large for me to believe it. （同义转换）

And my memory became ____________________________________________.