Gun control is a subject _____ American have argued for a long time.

The prize will go to the writer _____ story shows the most imagination.

I shall never forget the day _________Shen Zhou V was launched, _________has a great effect on my life.

She supports a culture ____ people believe they can make anything happen.

It was at the airport _____ was completed last year _____ he worked as a volunteer helping foreigners in need of translation service.

---Where did you save the drowning girl, _________parents were both professors?
---It was from the lake __________ she often went fishing.

A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ______ many factors lead to the change.

The old man has two sons, __________ lives with him, so he has always felt lonely since his wife’s death.

I often think of the hours _______ I stayed with you, _____ has had a great effect on my life.

_____ is shown in the report, teenager problems are often connected with family lifeeducation.