His proposal is ________ to all of us and you do not need to tell us more about it.

Finding the ______look on the student’ s face, the professor felt _____about his explanation. 

Nowadays, _______ cars are more and more popular.

—Volunteering is becoming increasingly popular in China. —Yeah, people are now ____that helping others is helping themselves.

After 5 days of fantastic space trip ,the two astronauts walked out of the spaceship, ______.