请说明详细语法和理由1there was -- Tv at that time,so we didn't know --

1there was __ Tv at that time,so we didn't know __ about the world.
A not;a lot of B no;little C no;a lot
答案为 C ；如果选A 那么,not +any
2there's __ sheep under the tree
A a little B little C few D a few
好题,答案为 A ,a little sheep ：一只小羊；sheep单数和复数形式一样都是sheep
如果选D 应该是there are 因为a few+复数
3People should sleep __ their windows __ at night
A let,open B with,opening Callow,open Dwith ,open
答案为D ,with+宾语+宾语补足语,open（开着的）不用opening；
希望能帮到您