Hai nhà du hành vũ trụ có thể trò chuyện với nhau mà không cần dùng máy vô tuyến bằng cách chạm 2 cái mũ của họ vào nhau. Giải thích âm đã được truyền đến tai hai người đó bằng cách nào?

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I. Fill in the blanks with the appropriate forms of adjectives in brackets. 1.Bangladesh is ...................... (wet) of three countries: Vietnam, UK and Bangladesh. 2. The Sahara is the .................. (hot) desert of the world. 3.Loch Lomond in Scotland is the (large) freshwater lake ................................. in the UK 4.Lake Erie (small) ... compared to Lake Huron. 5. Amazon River (long) ..................... compared to Mekong River 6.Fansipan is a mountain (high) .......................... in Vietnam. 7. The number of Everest is higher (high) ........................... than Mount Fansipan. 8. Travel by bus (cheap price) ... more than by taxi. II.Fill in the blanks with the appropriate prepositions. 1.Flower work ............ farm ............. countryside. 2. A nurse taking care of .................... the sick person. 3. The books are ................ the bookself. 4.His house in next ................. my house. 5.Jones living ............. Americans. 6. Mom is hardworking ... morning ............ evening. III. Please rewrite each sentence, starting with word suggestions so that the meaning of the sentence does not change. VD: 0. My house is bigger than your house Your house is smaller than my house 1. The black car is cheaper than the res car. The red car..................................................... 2. No one in the group is taller than Trung. Trung......................................................... 3. Do you have a better refrigerator than this ? Is this........................................................... 4. My house is the oldest house on the street. No house.....................................................