When you _____ into the gallery, you feel as if you____ inside a fragile, white seashell.

Helen _________ go on the trip with us, but she isn’t quite sure yet. 

— The terrible accident is under investigation．— Actually, quicker action _____ those workers trapped in the mine．

David did not regret saying what he did but felt that he     it differently.

. Mary said it was very important to her that she _____ her work.