________ is known to us all that the world weather is getting warmer and warmer.
The young teacher wants to help his students as much as he can, but ________ the other hand, he'd better help them learn on their own.
—I heard that he grew worse after taking the medicine.
—Yes. He was allergic________ to it.
—Your sister nearly devoted all her spare time ________ her study during the three years.
—That's right, or she ________ (take) first place in her school in the College Entrance Examination.
________ coincidence, John and I were born on the same day of the same year, and we have a lot in common.
It's typical ________ him to set his aim high but do little, so he is always leaving things undone.
