Peter is eight years old, and he goes to a school near his house. He always goes there and comes home on foot. He usually gets back on time, but last Friday he came home from school late. His mother saw him and said to him, "Why are you late today, Peter?" "My teacher was angry and told me to see the headmaster after class," Peter answered. "To see the headmaster?" his mother asked. "Why did she tell you to see him?" "Because she asked a question in class," Peter said, "And nobody could answer it except me." His mother became angry. "But why did your teacher tell you to see the headmaster then?" she asked. "Because her question was 'Who put the glue   on my chair?'" Peter said. Peter is   _  .
a naughty boy good at English a good boy a clever boy