—Does he know how to work out the problem ?—Yes , he has a good idea to solve it .
27. ______ he did was quite right.
26. His younger sister is often made to cry by him, but this time she made him ______.
25. Most of us think ______ important to know how to get well along with others.
24. More and more foreigners are working in China, ______?
23. The day before yesterday, I ______ one of my old friends in the street.