Помогите выбрать правильный ответ по английски

Помогите выбрать правильный ответ по английски1, This is her key...?
a)isnot it
b)isnot this
c)isnot there

2If it....tomorrow. we wel go for a walk
a)snows
b)will snow
c)snow

3 I donot know if it ...tomorrow
a)snows
b)will snow
c)snow

4 Football....a very popular game
a)is always
b)always was
c)has always been
5 Boys.you must do it...
a)yourself
b)yourselves
c)themselves