What is concerning us greatly is ________ the workers held up in that area yesterday will be set free.

Following the girl, we went into a hall, on ____ walls hung a few pictures of some famous scientists．

I merely made a joke with her, but she got angry — She _______ didn’t get it

下列字母组合中全是元音字母的是________________.

______ do you usually do at weekends, Susan — I usually help my parents do some housework.