Помогите,пожалуйста. Путаюсь в образованиях,вроде ничего сложного ,но всегда сомневаюсь в ответах.Если можно,то объясните почему именно такой ответ,хочу сама разобраться со следующими 10 вопросами,ибо их всего 20,а тут 10^^
Да простит меня моя учительница английского...

Are you ... her a present?
a) going buy
b)going to buy
c)going to buying

The children ... come with us this year
a) going not
b)aren't going
c)aren't going to

When I grow up I ... an artist
a)I will being
b)am
c)'m going to be

The floor is very wet. He ...
a)falls over
b)'s going to fall over
c)is falling over

The train is delayed so I ... late for work
a)'m going to be
b)'m being
c)can be

There's no moon so it ... very dark tonight
a)'m going to be
b)will being
c)'s going to be

My father ... fifty next Wednsday
a)is being
b)will to be
c)will be

I'm not hangry . I ... have any lanch today
a)think I not will
b)don't think I'll
c)don't think to

It's very hold in here . Ok, I ... the heating
a)'m going to turn on
b)'ll turn on
c)will turning on

Don't touch the cooker . You ... yourself
a)'ll burn
b)are going to
c)burn

Заранее спасибо ^^