—Let's play tennis.
—That sounds good,_______ I'm busy right now.
本题考查连词的用法。根据本题语境可知，打网球这个提议听起来很好，“但是”我现在很忙，根据设空处前后的转折关系可知所缺的词是but，故选A。
—I want to join the Food and Drink Club,but I can't cook.
—________. I can teach you.
题干中提到了“我想加入饮食社团，但是我不会做饭”，根据答语中的“我可以教你”可推断，所缺的句子是“Don't worry(别担心）”，故答案为A。
—Tina,are you going to play _______ football on School Day?
—Yes,and I'll also play _____ piano that afternoon.
本题考查play的短语。play football意为“踢足球”，football前不必加冠词；play the piano意为“弹钢琴，piano前要加定冠词the，故答案为C。