We find that some birds （）twice a year between hot and cold countries.

Connie was told that if she worked too hard, her health...

单项选择题Connie was told that if she worked too hard, her health would （）

Her jewelry （）under the spotlights and she became the d...

单项选择题Her jewelry （）under the spotlights and she became the dominant figure at the ball.

（）that the demand for power continues to rise at the cu...

单项选择题（）that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.