2. The person to answer the phone should always be polite to the caller.
3. When overall exports exceed imports, a country said to have a trade surplus.
4. I am writing with a view to find out whether you have anything wrong with you.
5. Reaching the age of four, Mozart's father gave him harpsichord lessons, and at the age of five he composed two minuets for the instrument.
각 문장에서 하나의 틀린 부분이 있는데 고쳐주세요..ㅠㅠ