70．If a volcano e__________, it explodes and sends smoke, fire and rock into the sky.

69．Nowadays, competition is so f__________; no parents can afford to see their child lay behind.

68．As is known, the number “12315” is usually dialed to protect the rights of c__________.

67．It is natural that p__________ creatures sometimes try to control weaker ones.

66．Mary will take charge of my job during my a__________.