Where did you get such a beautiful skirt— It was at the department store ____ we used toshop.

We should consider the students’ request ______the school library provide more books on popular science.

She was so angry at _____ he was doing _____she walked out without a word.

It’s over twenty years ______ we met lastCan we recognize each other when we meet at the airport?[ ]

They advocate the proposal we were opposed ______rediscussed at the next meeting.