1. He has gone abroad. He will return___two year's time.
2.____Saturdays I always go to the market.
3. I never go to the cinema___the week.
4. He ran a hundred metres___thirteen seconds.
5.I can't see him___the moment. I'm busy.
6. My birthday is_   November 7th. I was born__ 1974.
7.The days are very short__ December.

1. He has gone abroad. He will return_in_two year's time.

2.__on__Saturdays I always go to the market.

3. I never go to the cinema_during_the week.

4. He ran a hundred metres_in_thirteen seconds.

5.I can't see him_at_the moment. I'm busy.

6. My birthday is_on_   November 7th. I was born_in_ 1974.

7.The days are very short_in_ December.

The No 3 is wrong,It is IN

Actually, "during" is correct ,too.it has the same meaning with "in", you know, in some places, there could be several answers.not only one~
This is just my opinion.....