Your additions of the definite article can certainly be correct in context , as you said-- but if the questions are stand-alone, then the test taker cannot presume outside context, and the answers of these isolated questions could only be at university and for dinner . Does that help?
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AperisicTo simplify all what was said
- in prison
- at school
- to hospital
- in bed
- in school
- to church
- to hospital
- ...
All these examples do not use an article. When the article (either a/an or the) is not used like this, we are referring