—Can you tell me how many people will go to the exhibition?—Of course.About 3,000 students from 15 schools ______, and I think two-thirds will come.
We can't understand ______ a decision until it is too late.
Alien said that his trip was _______.
---- What do you think about English? ---- It's a difficult language _____.
I really don’t know ____ .
We all think it most foolish ______ this mistake.