根据句意，用括号内所给单词的适当形式填空。
______________(two) a week, I go shopping with my mother in that shopping mall.
Don’t talk to me right now. I’m busy _______________(write) a letter to my pen friend.
After school, we have a lot of time for our after-school _______________(act).
Millie enjoys __________ (exercise) with her grandmother in the park every morning.
Look at that coat. It must be one of those ________________ (swim).