---You ought to have warned him of the danger! --- ____! But he wouldn’t listen!
—What about the package of food? —You’d better _____ it at the service counter before entering the bookstore.
If you lose a customer, regret it _____ excuse it, or you will lose him for ever.
Don’t ______ personal information such as your name, telephone number and address until you feel comfortable.
The first decade in the 21st century is the one ______ many significant advances are made in China.
—Hey, dad. ______ —I can’t find my glasses.