Ⅰ. 用所给词的适当形式填空
1. We enjoy_______ (learn)English.
2. Betty has made great progress in ______(speak)Chinese.
3. Tony finds it really difficult ______(write)Chinese.
4. All of the work we do is ______(base)on science.
5. How kind he is! He always does what he can _____(help)me.
答案：1. learning 2. speaking 3. to write 4. based 5. to help
