For professional athletes, ________ to the Olympics means that they have a chance to enter the history books.
Hurry! Class ________. You know the first class _____ at 7:30.
Only when_______ 30 years old ______ to learn English.
All of us know that China has thousands of islands, _____ is Taiwan.
The politician was deeply hurt when many of his former support voted _______ him and he lost his place in the government.
Jack wasn’t saying anything,but the teacher smiled at him________he had done something very clever.