There are a number of methods to provide           relief from your toothache, which can’t cure the problem. 

(2013 ·郑州高中毕业班第一次质量预测)________ his strength failed and he dropped behind in the race.

I said hello to her with a smile in the yard, but she ________ me.

 ________ his strength failed and he dropped behind in the race.

(2013·泉州质检)In a natural disaster，minutes and even seconds of warning can make the ________ between life and death.