@1: "no answer" is automatically added if the question is NOT mandatory. For mandatory questions you have to manually add that option. If your question type supports default answers, just set "no answer" as default answer.

@2: At the advanced question settings there is the "answer width" options. Set it to something like 30 or 50 (these are percentage values).
If your template doesn't overwrite this, it should do the trick.

Add this to the end of template.css to force the table to full-width. Then use the "(Sub-)question width" setting to increase the answer text width.

Himaone wrote: ...
2. in the manual i get Answer width, but when i look the system it said : (Sub-) question width
thats make my survey not in good look...

Yes, because is sub question, not answers
Manual is outdated here.