is the ticket of the museum for children? — Well, it’s free for everyone.

Boys, don’t lose____ in playing Angry Birds. It is bad for your eyes to play computer games for a long time.

scientists have done a lot of research on A (H1N1) flu, there are still some cases for further study.[ ]

Did you have a sound sleep last night?— Yes, never slept ________.

Please get the information about zebras as ______ as possible.