填空题 You will hear a lecture about child development. While you listen, complete the sentences and answer the question. Use no more than 3 words for each answer. You will hear the recording twice. You now have 25 seconds to read the sentences and the questions below.

填空题 Who is the speaker talking to?

填空题 What is the main topic of this talk?

填空题 When do children first begin to make language-like noises?

填空题 At what age do most children begin to master the basics of grammar?

填空题 What does the speaker say about the grammatical mistakes that four-year-olds make?