根据汉语提示完成句子。

1. Families _____________ (聚会) for a big dinner in the Spring Festival.

2. They often wear scary clothes to _____________ (敲打) their neighbors' doors.

3. People in many countries give _____________ (互相) presents.

4. Christ ______________ (复活) on that day.

5. People start _____________ (为……准备) the festival a month before.

在一定的条件下，向一密闭的容器内加入X、Y、M、N四种物质，充分反应后，测定其质量，得到数据如下：

A．反应后物质M的质量为2g

B．物质X可能是该反应的催化剂

C．反应后生成Y的质量为32g

D．容器内发生了化合反应