F, About- recently- freely- invention- became- thanks – surface- breathing Most of the world’s (1)___________________ is water. We may know very well about the land, but we know very little (2)______________ the ocean. Until (3)_____________, man could not stay underwater for long. But now, with special (4)______________ equipment, a diver can stay longer. After the (5)_____________ of this equipment,man could swim (6)______________ underwater and scuba- diving (7)____________________ a popular sport. We can learn more about the undersea world (8)__________ to this invention. G, Nam :Hi, Why (1) _________________you absent yesterday, Minh? Minh : I had a (2) _____________ toothache. Nam : Oh, did (3)_____________go to the dentist? Minh : Yes ,I did .I went to the dentist(4) _______________ Nam : (5)_________________was the problem? Minh : Well. I had one small cavity, but it wasn’t serious. Minh : The dentist filled the cavity in my tooth. Nam : How do you feel now? Minh : I feel a lot better after she(6) ___________________my tooth. watch – around – show- series- listen - live H, Most teenagers (20)__________.the world (21) _____________TV. Many (22) _______________to the radio. In a lot of countries, the most popular shows on TV are (23) __________________ They (24) __________________ordinary characters and how to they (25)________________.

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