下列各句中，标点符号有错误的一句是（ ）（3分）

There is an ant in one of my hands. Can you guess what is in my ________ hand

______green or_______in a lightgreen room________good for us．

We have to _________our schooltrip till next week because of the heavy rain.

As we all know, great changes _______ in China in the past thirty years.