Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
The old man had a son and a daughter, ____ treated him well, _____ greatly disappointed him.
---Will this fish_____ until tomorrow? ---Only if you put it in the fridge.
Uncle Wang is a genius cook and we_____ never get enough of his cookies.
If a substance has a higher density, ____ 2, 000kg/ m³, it will not float on water.
Had it not been for the fact that she_____ in the leg, she might have passed the exam.