The boy failed four times, but he said he would try ___________.
We were scared to death when the fire ________. Fortunately, it was put out before it caused much damage.
He has ________ letters to answer and has to work from morning to night.
It’s ________ for the Shenzhou 7 spaceship that every Chinese feels cheerful and proud.
It is general believed that teaching is ________ it is a science.
________ by the beauty of nature, the girl from London decided to spend another two days on the farm.