____ 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?

①AgNO₃溶液　②NaOH溶液　③水．

用显微镜观察细胞某物体时，所用的目镜上标有“15×”，物镜上标有“4×”，那么所观察到的物体被放大了（    ）