不 or 没, in the past?

Pick the right one: 不 or 没.

1. 1

   我昨天 去上班。 (I did not go to work yesterday)

   wǒ zuó tiān ___ qù shàng bān 。 (I did not go to work yesterday)

   不bù没méi
2. 2

   我小时候 喜欢吃鱼。 (as a child I did not like fish)

   wǒ xiǎo shí hou ___ xǐ huan chī yú 。 (as a child I did not like fish)

   不bù没méi
3. 3

   他以前 是老师。 (he was not a teacher before)

   tā yǐ qián ___ shì lǎo shī 。 (he was not a teacher before)

   不bù没méi
4. 4

   上个星期我 看见他。 (I did not see him last week)

   shàng gè xīng qī wǒ ___ kàn jiàn tā 。 (I did not see him last week)

   不bù没méi
5. 5

   那时候我 会说中文。 (back then I could not speak Chinese)

   nà shí hou wǒ ___ huì shuō zhōng wén 。 (back then I could not speak Chinese)

   不bù没méi
6. 6

   我 去过北京。 (I have never been to Beijing)

   wǒ ___ qù guò běi jīng 。 (I have never been to Beijing)

   不bù没méi