6.experiment 7.operate 8_communication II 1.energy 2.whole 3.dug 4.physics 5.X-ray
III 1.When 2.what to see 3.can't, anything 4.as well 5.If you
IV 1.Flying kites is popular among people of all ages. 2.I want to fill the box with books. 3.They compared the first map with the second one carefully. 4.Could you find out when the meeting will begin? 5.She can sing as well as dance.