Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
-----What are you afraid ______? -----I’m afraid ______ dogs.
-----I just heard that the tickets for tonight’s show have been sold out. -----Oh no! ______.
He paid the boy 10 yuan foe washing ten windows, most of ____ hadn’t been cleaned for at least a year.
She thought I was talking about her daughter, ________, in fact, I was talking about my daughter.
What does "quake" mean _____ in the word "earthquake"?