Who called just now? —I don’t know because I didn’t______ his voice.

I think you should complain _____ you are happy with the situation.

Tim，you are leaving for Jiuzhaigou tomorrow. Why not pack your clothesand food up now—________.

The man entered the room and looked everywhere ________ in search of something[ ]

It rained heavily in the south, ________ serious flooding in several provinces.[ ]