下列词语中加点的字，每对读音都不相同的一组是 (3分)

_________ its positive or negative effect, change can be stressful.

下列各句中，加点的成语使用恰当的一项是（）

To start with, they talked with the movie in English, but they ended up in Chinese.

My classmates and I_____ to Guangzhou this weekend to visit our teacher.[ ]