When my grandfather retired(退休) at the age of 60, he took a sea ________ around the world, which had been his dream since his childhood.
It's reported that a plane with five people __________ crashed several days ago.
__________ of 5000 visitors came to the exhibition. And __________,the museum got an income (收入)of $10,000.
The book cost me 12 yuan in all, postage __________.
Walking alone in the dark, the boy whistled to __________ his courage.
I don't think the experiment is __________ failure. At least we have gained __________ experience for future success.