Who can you turn to in time of danger, it not___ .

＿＿＿the people have become the master of their own country＿＿＿science can really serve the people. 

 —Did you see Peter and Mike? — No, I saw ______of them.

— Which would you like to drink, coffee, yogurt or orange juice?—          . Please give me a cup of tea.

 When the Greens moved into the house last week, ____was at sixes and sevens, so they did a big cleaning.