【题目】选择适当的形式填空
1. I’m ______ (write) goodbye letters to all my friends.
2. There _______ (be) forty students in my class.
3. How many _______ (book) have you got?
4. ___________ (Wish) you happiness every day.
【答案】1. writing
2. are
3. books
4. Wishing
【解析】
Wish开头的祝福语，一般只使用现在分词，表示正在祝愿。