It’s clear that global warming will lead to crop failures and weather.
| A．dusty | B．useless | C．stubborn | D．extreme |
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.
| A．which | B．that | C．it | D．what |
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.
| A．greatly | B．necessarily | C．fully | D．nearly |
Many people believe we are heading for environmental disaster _____ we basically change the way we live.
| A．but | B．although | C．unless | D．once |
—Who _____ it be that is knocking at the door?
—It ______be father, but I’m not sure.
| A．can; may | B．may; can | C．may; must | D．need; should |
You can't imagine _____when they received these nice Christmas presents.
| A．how they were excited | B．how excited they were |
| C．how excited were they | D．they were how excited |