. Experts have warned ______ of the health risks caused by passive smoking.
Since I bought the book two weeks ago, I ______ hardly ______ time to open it, just because of the research paper.
As is widely accepted, _______ students should have ______ easy access to labs, libraries and other facilities at school.
---Peter was killed in the earthquake! ---_____ I talked with him last week.
It was along the Mississippi River ______ Mark Twain spent much of his childhood _____ the story happened.A. which; that B. that; which C where; that D. that ;that
---How long ______ in Shanghai? --- For two weeks. I’m going to visit some schools in Shanghai.