I stayed at home alone and waited for something ____ to happen

正是由于____流、____ 流和____流的存在，使生物之间的联系错综复杂，生物与环境才成为统一的整体．

—Must we leave the classroom now?

— No, you _____. You _____ leave after the bell rings.

____ We had a lot of fun _______ (sing) in the classroom.
____ She decided ________ (buy) the red dress.
____ This sound made the baby ________ (cry).
____ Most boys enjoy _______ (play) football after school.
____ The shop is always ______ (crowd) on weekends.
____  Would you like _____ (go) shopping with me?
____ I saw a little girl ______ (look) for her parents on the street when I walked across it.
____ ______ (be) you at the shop last Friday?
____ The boy spends a lot of time ________ (practice) the piano in the room.
____ Look! Who _______ (stand) near the door?