—What do you think our descendants(后代) be like in thousands of years?—Who knows exactly what happen to human beings?
I was about to leave _____ the telephone rang.
Children under 10 are not permitted _____ the film.
All he was thinking about was ____ he would do with the big sum of money his father gave him.
23. The harder we work at our lessons, _____.
22. The government officials say that the Art Festival aims at _____ the relationship between nations.