The Titanic, the biggest ship of its day, ____ unsinkable, but it sank on its first voyage in 1912.
—Sir, I’d like to take a week’s holiday. —____. We’ re too busy now.
—He looks very happy. He ____have passed the exam, —I guess so. It’s not difficult after all.
Nowadays, most people,in order to keep fit,prefer walking to driving ____necessary.
Giving children pocket money as a gift during the Spring Festival is a common ____ in China.
_____with this challenge, he should meet it without any hesitation.