________ seems to be a strong competition in China for senior high students to enter college or university.
China began selling tickets for the Wuhan-Guangzhou high-speed railway, ______ boasts the world's fastest train journey with a 350km per hour average speed.
The officials said the downward trend of A/H1N1 flu activity did not______ mean the worst was over. Flu activity might pick up next year.
Many people believe we are heading for environmental disaster _____ we basically change the way we live.
—Who _____ it be that is knocking at the door?—It ______be father, but I’m not sure.
You can't imagine _____when they received these nice Christmas presents.