请根据下列任务预习课文，并在课堂上按照老师的引导检查各项任务的完成情况。
Task I. Skimming
Read the text (P18-P19) quickly and fill in the blanks.
The text consists of two parts. The first part is a letter from a grandfather to his grandson explaining how people 1. ________ smoking and why he should give it up. The second part gives some advice on how to 2. ________.
Task II. Careful reading
