．I really don’t know _______I kept the secret papers．

____ person like him won’t be simply satisfied with ___ progress that has been made.

All of us Were＿＿at the ＿＿news.

She is going to ____ the plane to Beijing.

Have you decided where to go for your summer vacation? –Not yet. We_________ go to Mount Lu. It is a good place for vacation.