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1. No one could answer these questions correctly.
These questions . 

2. They managed to finish the project in time for the presentation.
They succeeded . 

3. It is better to wear out than rust out.
To rust out . 

4. I don′t agree with prohibiting smoking in bars.
I′m not in . 

5. If you don′t know how to spell the word, why don′t you check in the dictionary?
Why don′t you look ?