在下列各句的空白处填上一个最适当的词,使句意完整。(20分) 1. -How old are you, Mrs Green? -Oh, sorry. It's a ________. 2. He is good at singing. He will become a famous ________. 3. The boy is a good student and he is an ________ boy. 4. He often tells some humour and makes me ________