We can see more police than usual at the crossings ________ snowy days.

Why are wetlands so important to wildlife— Because it can ______ them with food and cover.

The reason why we were so late is________

It’s said that MrWang ______ into a new apartment last Sunday.–RightI went to his help

Miss Gao asked her mother if she _______ to the hospital the day before when she was out