2.--- Why were you absent yesterday? --- I caught a cold, _______I had been walking around in the rain.
—Have you got your exam papers? —Not yet. I guess they _____ at this moment.
—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.