----when are you going off for your holiday?
----My plane ______ at 9:20, so I must be at the airport by 8:20.
| A．took off | B．has taken off |
| C．is taking off | D．would take off |
32. Fireworks, ________ of gun powder or flash powder _______ in a tight paper tube, make the big flash or boom effect.
| A．consisting…wrapping | B．consisting…wrapped |
| C．consisted…wrapped | D．being consisted….wrapped |
31. In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.
| A．that | B．where | C．what | D．Which |
30. Chinese must have the largest number of speakers, ________ ?
| A．mustn’t that | B．haven’t they |
| C．don’t they | D．doesn’t it |
28. More Than a Game, a documentary which follows NBA star LeBrown James’s path
_________ a star, came out on October 2, 2009 in the US.
| A．to become | B．to becoming | C．in becoming | D．during becoming |
27. A: What’s the matter, Sara? You wear a sad look on your face.
B: Oh, nothing much. As a matter of fact, I _______ of my friends back home.
| A．just thought | B．have just been thinking |
| C．was just thinking | D．have just thought |