Many parents made their daily routine to get out for a walk in the evening.

Tired, Jim was fast asleep with his back ________ a big tree.[ ]

Obesity is ________ major concern for public health officials and also may affect ________ test scores of students.

________confidence and the necessary equipment, they failed to rescue the 42 miners trapped in the coal mine.

Radium salts，which have been found to______ in bones，give rise to bone cancer.