Task 1. Below are some common ways of accepting or refusing an invitation. Read them, and fill each blank of the notes with a suitable expression.
Task 2. Rearrange the following sentences to make a letter accepting an invitation to spend a weekend in the country.
Task 3. One of your friends has invited you to go for a picnic to Cuc Phuong National Park next weekend. Write a reply letter accepting or declining his/her invitation.