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1. You will pass the exam if you study harder.
Unless you . 

2. Practice speaking English every day or you can′t improve your English.
If . 

3. It rained so heavily that they decided to cancel the match.
So heavily . 

4. “I′m very busy. I′ll ring you tomorrow”, Susan said to me.
Susan . 

5. “Where do you live?” The interviewer said to me.
The interviewer .