Many wines improve____ age, and it is the same with friendship.
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.
—Do you know Tom came _____ third in the marathon held yesterday? —Yeah!And it was _____ 18-hour bicycle marathon.