Đề bài: Write one word in each gap 1) Turn all the lights.......... when you leave the room. We don't want to waste electricity! 2) ................ my opinion, modern technology has improved all our lives. 3) Could you disconnect your laptop.............. the internet when you 've finished checking your e-mail? 4) We thought the experiment would work, but .................. the end it didn't. 5) ...............last, someone has built a battery- powered skateboard! 6) How many different types................ building can you think of ? 7) That programme is about to start , so I'll turn............the TV 8) Ice floats in water. Can you think of a reason.......... that?