What impressed me most in his report lies in the words to bring about an _________ of the conditions of the working men and women.
The professor gave orders that the test ___________before 5:30.
The possibility of a way out of the impasse(僵局) had never ____________ to anyone.
I appreciated ____ the opportunity to study abroad two years ago.
_______, I’d have told you.
20. He reads newspapers every day to keep himself_______about what's going on in the world.