Exercícios com "For" e "Since" em inglês

Assinale a alternativa correta usando "For" ou "Since" em inglês.
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Her grandparents walk _______ thirty minutes a day.
Possíveis Respostas:
That lady has been waiting for the train _______ noon.
Possíveis Respostas:
I haven't eaten anything _______ breakfast.
Possíveis Respostas:
Barbara and Larry have been at the office _______ a long time.
Possíveis Respostas:
I have been calling my mother _______ half an hour.
Possíveis Respostas:
My family has lived here _______ last summer.
Possíveis Respostas:
I studied for this test _______ seven days straight.
Possíveis Respostas:
He has worked there _______ he finished college.
Possíveis Respostas:
Matthew has been asleep _______ only a few minutes.
Possíveis Respostas:
Tourism has been increasing _______ the end of last year.
Possíveis Respostas: