I hate it when she calls me at work—I'm always too busy to _____ a conversation with her.
A：carry on
B：break into
C：turn down
D：cut off
All of them have gone out. There is ______ in the classroom.
①抗日战争的胜利 ②飞夺泸定桥 ③井冈山革命根据地的建立 ④百团大战
在常温条件下不能完成的化学反应或实验是（ ）
