If I ___ free tonight, I'll go to the cinema with you.
| A．am | B．was | C．will be | D．be |
----Why are the housing prices in big cities going up all the time?
----One reason is that people are__________ into overcrowded cities in great numbers.
| A．breaking | B．filling | C．pouring | D．hurrying |
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 |