问题
填空题
用所给单词的适当形式填空。
1. — Where are you _____________ (go)?
— To the _____________ (stair).
2. Two _____________ (plus) four _____________ (equal) six.
3. Sorry! I _____________ (do) understand. Please speak _____________ (slow).
答案
1. going, stairs 2. plus, equals 3. don't, slowly
平面系是（）