【正文】
ad books about science than before. _______________ Unit 2 Ⅰ . 1. should 2. volleyball 3. lazy 4. activities 5. imagine Ⅱ . 1. useful 2. develop 3. success 4. skills 5. teenager Ⅲ . 1. such as 2. It’s。 to sing 3. spend。 playing / on 4. as a result 5. as well as[ Ⅳ . 1. sail→sailing 2. to cycle→cycling 3. teach→to teach 4. read → reading 5. to read→reading