根据句意填写适当的单词。

l. We must _____ our classroom clean.

2. There are some _____ between the two pictures.

3. He _____ goes to restaurant for dinner, because the restaurant is not clean.

4. Katrina doesn't often _____ coffee, she likes green tea.

5. My eating _____ are not very good.

在预警活动中，（）活动对实现事故现象的判别，使企业生产安全管理在繁杂多变的致灾因素中能确定预警工作重点，也使诊断和评价活动有明确的目标。

A．监测

B．诊断

C．识别

D．评价