Mrs. Wang was so ________ that she couldn’t stop _________.

While _______ across the street, you should be careful.[ ]

The book didn’t________ children probably because the author employed too many scientific terms in it.[ ]

The European Union universities are _______ most attractive because they have ______ diversity of cultures and teaching methods.

They have________signs in some places to remind (提醒)the visitors not to step on the grass.