When I was talking to her about her table manners, she stared at me as if listening to me attentively but I could see that her mind ______somewhere else.

A．wondering

B．walking

C．wandering

D．thinking of

因（）集体合同发生争议，经协商解决不成的，工会可以依法申请仲裁、提起诉讼

A.签订

B.履行

C.订立

D.检查