下列各句中，没有语病的一句是（ ）

President Obama held talks with Chinese President Hu Jintao in Beijing, ________ economic recovery, climate change and stopping the spread of nuclear weapons.

There are many shops on ____ side of the street.We can buy everything we want.

All of the following are our school rules except “”.

What do you often do _____________ classes to relax?–Listen to music or walk around the school.A．over